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A371147
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E.g.f. satisfies A(x) = 1/(1 - x*A(x))^(x^2*A(x)^2).
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0
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1, 0, 0, 6, 12, 40, 2700, 21168, 173040, 7611840, 125415360, 1848591360, 71211998880, 1844075600640, 41500836336960, 1609925690419200, 55708371912211200, 1719475797882286080, 72091120665964654080, 3046645011228998860800, 119757727692451283097600
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OFFSET
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0,4
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LINKS
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FORMULA
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a(n) = n! * Sum_{k=0..floor(n/3)} (n+1)^(k-1) * |Stirling1(n-2*k,k)|/(n-2*k)!.
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PROG
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(PARI) a(n) = n!*sum(k=0, n\3, (n+1)^(k-1)*abs(stirling(n-2*k, k, 1))/(n-2*k)!);
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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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