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A013191 Expansion of e.g.f. log(cosh(x) + tanh(x)). 0
0, 1, 0, -3, 12, -15, -120, 1197, -6048, -255, 428160, -5448003, 29812992, 241437105, -8332047360, 104019879597, -293043130368, -17849464279935, 456591699640320, -5108933510880003, -26996975653552128 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..20.

EXAMPLE

x - 3/3!*x^3 + 12/4!*x^4 - 15/5!*x^5 - 120/6!*x^6 ...

CROSSREFS

Sequence in context: A005392 A001196 A096854 * A009783 A192786 A277738

Adjacent sequences:  A013188 A013189 A013190 * A013192 A013193 A013194

KEYWORD

sign

AUTHOR

Patrick Demichel (patrick.demichel(AT)hp.com)

EXTENSIONS

a(0)=0 inserted and title improved by Sean A. Irvine, Aug 01 2018

STATUS

approved

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Last modified October 22 18:55 EDT 2018. Contains 316500 sequences. (Running on oeis4.)