%I #7 Jul 23 2018 20:14:08
%S 0,0,2,-3,0,-10,-80,1764,-7392,17856,-41792,-7382320,134784320,
%T -1068379104,7660192384,35293839840,-4466084847616,93476460710912,
%U -1176630882269184,10358160914068992,214589448557477888
%N Expansion of e.g.f. arctan(tanh(x) * log(x+1)).
%e 2/2!*x^2 - 3/3!*x^3 - 10/5!*x^5 - 80/6!*x^6 ...
%K sign
%O 0,3
%A Patrick Demichel (patrick.demichel(AT)hp.com)
%E a(0) and a(1) inserted and title improved by _Sean A. Irvine_, Jul 23 2018