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

Terms

a(0) =1a(1) =1a(2) =3a(3) =6a(4) =20a(5) =40a(6) =152a(7) =224a(8) =1024a(9) =1152a(10) =6272a(11) =5632a(12) =35840a(13) =26624a(14) =194560a(15) =122880a(16) =1015808a(17) =557056a(18) =5144576a(19) =2490368a(20) =25427968a(21) =11010048a(22) =123207680a(23) =48234496a(24) =587202560a(25) =209715200a(26) =2759852032a(27) =905969664a(28) =12817793024a(29) =3892314112