Expansion of e.g.f. cosh(log(1+x)^2).

Terms

a(0) =1a(1) =0a(2) =0a(3) =0a(4) =12a(5) =-120a(6) =1020a(7) =-8820a(8) =82908a(9) =-867888a(10) =10145760a(11) =-131406000a(12) =1864232832a(13) =-28656815616a(14) =473108471472