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

Terms

a(0) =1a(1) =-1a(2) =2a(3) =-7a(4) =31a(5) =-161a(6) =976a(7) =-6847a(8) =54797a(9) =-493201a(10) =4932046a(11) =-54252551a(12) =651030667a(13) =-8463398737a(14) =118487582396