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0, 1, 4, 19, 124, 1069, 11464, 146599, 2173624, 36633049, 691362124, 14440672699, 330674815924, 8236528396549, 221694575073424, 6411977928702799, 198310761891213424, 6530970632654064049, 228174066109353835924
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OFFSET
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1,3
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LINKS
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FORMULA
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G.f.: A(x)=x/(1-x)/(U(0)-x), where U(k)= (2*k+1)*x + 1 - (2*k+3)*x/U(k+1); (continued fraction Euler's 1st kind, 1-step ). - Sergei N. Gladkovskii, Jun 27 2012
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MAPLE
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a[1]:=0: a[2]:=1: for n from 3 to 30 do a[n]:=(2*n-2)*a[n-1]-(2*n-3)*a[n-2] od:seq(a[j], j=1..18); # Emeric Deutsch, Dec 20 2004
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MATHEMATICA
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s = 0; lst = {s}; Do[s += n!!; AppendTo[lst, s], {n, 1, 32, 2}]; lst (* Zerinvary Lajos, Jul 13 2009 *)
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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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EXTENSIONS
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STATUS
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approved
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