A013187 - OEIS

%I #10 Aug 05 2018 18:06:27

%S 0,1,0,1,-4,25,-120,761,-5024,42065,-378240,3898321,-42905344,

%T 521329705,-6794511360,96017526281,-1448243646464,23356125062945,

%U -399450070548480,7240133620964641,-138422733355024384

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

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

%K sign

%O 0,5

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

%E a(0)=0 inserted and title improved by _Sean A. Irvine_, Aug 01 2018