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A010793
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a(n) = n!*(n+4)! / 4!.
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5
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1, 5, 60, 1260, 40320, 1814400, 108864000, 8382528000, 804722688000, 94152554496000, 13181357629440000, 2174924008857600000, 417585409700659200000, 92286375543845683200000, 23256166637049112166400000, 6628007491558996967424000000
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listen;
history;
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internal format)
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OFFSET
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0,2
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LINKS
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FORMULA
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Sum_{n>=0} 1/a(n) = 24*BesselI(4,2).
Sum_{n>=0} (-1)^n/a(n) = 24*BesselJ(4,2). (End)
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MAPLE
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f := n->n!*(n+4)!/4!;
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MATHEMATICA
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Table[n! * (n + 4)!/24, {n, 0, 20}] (* Amiram Eldar, Sep 27 2022 *)
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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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STATUS
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approved
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