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A191635 E.g.f. 1/(1-log(1+tanh(x))) 0
1, 1, 1, 0, -4, -10, 14, 196, 440, -3168, -27856, -16192, 1164272, 7585552, -23621872, -695464800, -3191206912, 38919085184, 661218763136, 1320994868224, -74958266666752, -932434904045568, 2633042904931328, 193750955482836992 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,5

LINKS

Table of n, a(n) for n=0..23.

FORMULA

a(n)=sum(m=1..n, m!*sum(r=m..n, (stirling1(r,m)*sum(k=r..n, binomial(k-1,r-1)*k!*2^(n-k)*stirling2(n,k)*(-1)^(r+k)))/r!)), n>0, n(0)=1.

PROG

(Maxima)

a(n):=sum(m!*sum((stirling1(r, m)*sum(binomial(k-1, r-1)*k!*2^(n-k)*stirling2(n, k)*(-1)^(r+k), k, r, n))/r!, r, m, n), m, 1, n);

CROSSREFS

Sequence in context: A175588 A239788 A136862 * A123925 A310425 A310426

Adjacent sequences:  A191632 A191633 A191634 * A191636 A191637 A191638

KEYWORD

sign

AUTHOR

Vladimir Kruchinin, Jun 20 2011

STATUS

approved

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Last modified February 17 02:22 EST 2020. Contains 331976 sequences. (Running on oeis4.)