Expansion of e.g.f. cosh(x)^2*(x+x^2/2).

Terms

a(0) =0a(1) =1a(2) =1a(3) =6a(4) =12a(5) =40a(6) =120a(7) =224a(8) =896a(9) =1152a(10) =5760a(11) =5632a(12) =33792a(13) =26624a(14) =186368a(15) =122880a(16) =983040a(17) =557056a(18) =5013504a(19) =2490368a(20) =24903680a(21) =11010048a(22) =121110528a(23) =48234496a(24) =578813952a(25) =209715200a(26) =2726297600a(27) =905969664a(28) =12683575296a(29) =3892314112