Expansion of g.f. (1+x)*(3+x)/(1+6*x^2+x^4).

Terms

a(0) =3a(1) =4a(2) =-17a(3) =-24a(4) =99a(5) =140a(6) =-577a(7) =-816a(8) =3363a(9) =4756a(10) =-19601a(11) =-27720a(12) =114243a(13) =161564a(14) =-665857a(15) =-941664a(16) =3880899a(17) =5488420a(18) =-22619537a(19) =-31988856a(20) =131836323a(21) =186444716a(22) =-768398401a(23) =-1086679440a(24) =4478554083a(25) =6333631924a(26) =-26102926097a(27) =-36915112104a(28) =152139002499a(29) =215157040700