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6, 6, 11, 31, 121, 601, 3601, 25201, 201601, 1814401, 18144001, 199584001, 2395008001, 31135104001, 435891456001, 6538371840001, 104613949440001, 1778437140480001, 32011868528640001, 608225502044160001
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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0,1
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LINKS
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FORMULA
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(n-2)*a(n) - (n^2-n-1)*a(n-1) + (n-1)^2*a(n-2) = 0. [Bruno Berselli, Sep 28 2013]
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MAPLE
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MATHEMATICA
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PROG
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(Magma) [5*Factorial(n) + 1: n in [0..20]]; /* or */ [6] cat [n eq 1 select n+5 else n*Self(n-1)-n+1: n in [1..25] ]; // Vincenzo Librandi, Sep 28 2013
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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