A013187 - OEIS

A013187

Expansion of e.g.f. log(cosh(x) + tan(x)).

0, 1, 0, 1, -4, 25, -120, 761, -5024, 42065, -378240, 3898321, -42905344, 521329705, -6794511360, 96017526281, -1448243646464, 23356125062945, -399450070548480, 7240133620964641, -138422733355024384

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OFFSET

0,5

LINKS

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

EXAMPLE

x + 1/3!*x^3 - 4/4!*x^4 + 25/5!*x^5 - 120/6!*x^6 ...

CROSSREFS

Sequence in context: A110051 A334551 A273023 * A069639 A013582 A260373

Adjacent sequences: A013184 A013185 A013186 * A013188 A013189 A013190

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