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A108078
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Determinant of a Hankel matrix with factorial elements.
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2
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1, 2, 12, 576, 414720, 7166361600, 4334215495680000, 125824009525788672000000, 230121443546659694208614400000000, 33669808475874225917238947767910400000000000, 487707458060712424140716248549520230160793600000000000000
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OFFSET
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0,2
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COMMENTS
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The term (n=1) is a degenerate case, a matrix with single element 2. This sequence involves products of binomial coefficients and is related to the superfactorial function.
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REFERENCES
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M. J. C. Gover, "The Explicit Inverse of Factorial Hankel Matrices", Department of Mathematics, University of Bradford, 1993
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LINKS
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FORMULA
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a(n) = (n+1)! * Product_{i=1..n-1} (i+1)! * (n-i)!.
a(n) ~ n^(n^2 + 2*n + 11/6) * 2^(n+1) * Pi^(n+1) / (A^2 * exp(3*n^2/2 + 2*n - 1/6)), where A = A074962 is the Glaisher-Kinkelin constant. - Vaclav Kotesovec, Apr 16 2016
a(n) = G(n+1) * G(n+3), where G(n) is the Barnes G function. - Jan Mangaldan, May 22 2016
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MAPLE
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with(LinearAlgebra):
a:= n-> Determinant(Matrix(n, (i, j)->(i+j)!)):
# second Maple program:
a:= n-> (n+1)! * mul((i+1)!*(n-i)!, i=1..n-1):
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MATHEMATICA
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Table[BarnesG[n + 1] BarnesG[n + 3], {n, 20}] (* Jan Mangaldan, May 22 2016 *)
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PROG
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(MATLAB)
% the sequence is easily made by:
for i=1:n det(gallery('ipjfact', i, 0)) end
% or, more explicitly, by:
d = 1; for i=1:n-1 d = d*factorial(i+1)*factorial(n-i); end d = d*factorial(n+1);
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CROSSREFS
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KEYWORD
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easy,nonn
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AUTHOR
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EXTENSIONS
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a(0)=1 prepended and some terms corrected by Alois P. Heinz, Dec 05 2015
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STATUS
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approved
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