E.g.f.: log(cosh(x)+log(x+1)).

Terms

a(0) =0a(1) =1a(2) =-1a(3) =4a(4) =-19a(5) =113a(6) =-813a(7) =6921a(8) =-68290a(9) =766909a(10) =-9660965a(11) =134950693a(12) =-2070706988a(13) =34628733267a(14) =-626946816195