Expansion of (1 + x*exp(x))^2.

Terms

a(0) =1a(1) =2a(2) =6a(3) =18a(4) =56a(5) =170a(6) =492a(7) =1358a(8) =3600a(9) =9234a(10) =23060a(11) =56342a(12) =135192a(13) =319514a(14) =745500a(15) =1720350a(16) =3932192a(17) =8912930a(18) =20054052a(19) =44826662a(20) =99614760a(21) =220201002a(22) =484442156a(23) =1061158958a(24) =2315255856a(25) =5033164850a(26) =10905190452a(27) =23555211318a(28) =50734301240a(29) =108984795194