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A004664
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a(n) = n! + n^2.
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4
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1, 2, 6, 15, 40, 145, 756, 5089, 40384, 362961, 3628900, 39916921, 479001744, 6227020969, 87178291396, 1307674368225, 20922789888256, 355687428096289, 6402373705728324, 121645100408832361, 2432902008176640400, 51090942171709440441, 1124000727777607680484
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OFFSET
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0,2
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COMMENTS
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LINKS
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FORMULA
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Possible recurrence relation (according to WolframAlpha): a(n+2) = ((n+2)*(n^3+n^2-n-2)*a(n+1))/(n^3-2*n-1)-((n+2)*(n^2+n-1)*a(n))/(n^2-n-1). - Alexander R. Povolotsky, Nov 06 2010
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MATHEMATICA
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PROG
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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