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1, 2, 3, 5, 15, 137, 4393, 518625, 239478123, 455196345315, 4054931519864889, 157048983466046778713, 33902817175022723879495899, 33209307490198775518644207834495, 202452250996395056747517509528867065999
(list;
graph;
refs;
listen;
history;
text;
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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EXAMPLE
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1 1
1 1 2
1 1 1 3
1 2 1 1 5
1 6 6 1 1 15
1 24 90 20 1 1 137
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MATHEMATICA
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Table[Sum[((n-k)*k)! / (k!)^(n-k), {k, 0, n}], {n, 0, 15}] (* Vaclav Kotesovec, Nov 24 2023 *)
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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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