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Expansion of e.g.f. arctan(tanh(x) * log(x+1)).
0

%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