A012358 - OEIS

%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