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%I #8 Jul 18 2018 18:46:09
%S 0,0,2,-3,16,-50,560,-4116,49376,-495648,6885568,-93060880,1541938880,
%T -25786609056,491456933760,-9706007213280,211232587063296,
%U -4810337505293312,118025076480927744,-3034967141004516864,82967370464849969152,-2375277511119683573760
%N Expansion of e.g.f. arctanh(tan(x) * log(x+1)).
%e 2/2!*x^2 - 3/3!*x^3 + 16/4!*x^4 - 50/5!*x^5 ...
%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 18 2018