Expansion of e.g.f.: tanh(x)/cos(log(1+x)).

Terms

a(0) =0a(1) =1a(2) =0a(3) =1a(4) =-12a(5) =76a(6) =-480a(7) =4264a(8) =-45248a(9) =514180a(10) =-6418080a(11) =89205348a(12) =-1356339600a(13) =22268993280a(14) =-393425899776