Expansion of c(x^2+x^3), c(x) the g.f. of A000108.

Terms

a(0) =1a(1) =0a(2) =1a(3) =1a(4) =2a(5) =4a(6) =7a(7) =15a(8) =29a(9) =61a(10) =126a(11) =266a(12) =566a(13) =1212a(14) =2619a(15) =5685a(16) =12419a(17) =27247a(18) =60049a(19) =132847a(20) =294931a(21) =656877a(22) =1467258a(23) =3286218a(24) =7378240a(25) =16603458a(26) =37441990a(27) =84599854a(28) =191501532a(29) =434224404