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A192566
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a(n) = abs(stirling1(n,k))*stirling2(n+1,k+1)*k!^2,k=0..n).
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0
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1, 1, 7, 122, 3926, 201444, 15081256, 1551423600, 209964727584, 36170279518320, 7728442094221344, 2005825817037374496, 621563279659462241856, 226678766174046141016320, 96106307573596013377908480, 46874174201481263768233403904
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OFFSET
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0,3
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LINKS
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Table of n, a(n) for n=0..15.
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FORMULA
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a(n) ~ c * LambertW(-1, -r*exp(-r))^n * n!^2 / (sqrt(n) * LambertW(-exp(-1/r)/r)^n), where r = 0.673313285145753168... is the root of the equation (1 + 1/(r*LambertW(-exp(-1/r)/r))) * (r + LambertW(-1, -r*exp(-r))) = 1 and c = 0.63319930751748217157127596837987799731063242340102342707708047131... - Vaclav Kotesovec, Jul 05 2021
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MATHEMATICA
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Table[Sum[Abs[StirlingS1[n, k]]StirlingS2[n+1, k+1]k!^2, {k, 0, n}], {n, 0, 100}]
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PROG
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(Maxima) makelist(sum(abs(stirling1(n, k))*stirling2(n+1, k+1)*k!^2, k, 0, n), n, 0, 24);
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CROSSREFS
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Sequence in context: A012103 A012086 A074487 * A322090 A360337 A304420
Adjacent sequences: A192563 A192564 A192565 * A192567 A192568 A192569
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KEYWORD
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nonn
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AUTHOR
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Emanuele Munarini, Jul 04 2011
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STATUS
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approved
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