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A344419
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a(n) = n*a(n-1) + n^(n mod 2), a(0) = 0.
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3
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0, 1, 3, 12, 49, 250, 1501, 10514, 84113, 757026, 7570261, 83272882, 999274585, 12990569618, 181867974653, 2728019619810, 43648313916961, 742021336588354, 13356384058590373, 253771297113217106, 5075425942264342121, 106583944787551184562, 2344846785326126060365
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OFFSET
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0,3
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LINKS
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FORMULA
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E.g.f.: ((x+1)*cosh(x)-1)/(1-x).
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MAPLE
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a:= proc(n) a(n):= n*a(n-1) + n^(n mod 2) end: a(0):= 0:
seq(a(n), n=0..23);
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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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