Expansion of log(1+x)/cos(sinh(x)).

Terms

a(0) =0a(1) =1a(2) =-1a(3) =5a(4) =-12a(5) =89a(6) =-345a(7) =3093a(8) =-17136a(9) =182097a(10) =-1334025a(11) =16371365a(12) =-150969324a(13) =2101489961a(14) =-23556117585a(15) =367038504693