E.g.f. sin(arctan(log(1+x))).

Terms

a(0) =0a(1) =1a(2) =-1a(3) =-1a(4) =12a(5) =-36a(6) =-120a(7) =2148a(8) =-9744a(9) =-64572a(10) =1454220a(11) =-8208828a(12) =-96161472a(13) =2479373064a(14) =-15862726152a(15) =-295638678072