Expansion of e.g.f. log(cosh(x)-log(x+1)).

Terms

a(0) =-1a(1) =1a(2) =2a(3) =5a(4) =-13a(5) =-63a(6) =-453a(7) =1822a(8) =9683a(9) =174325a(10) =-960133a(11) =-2767796a(12) =-180618579a(13) =1333355779a(14) =-2799332651a(15) =400791892784