Expansion of 1/((1-x^2*c(x))(1-x-x^2)) where c(x) is the g.f. of A000108.

Terms

a(0) =1a(1) =1a(2) =3a(3) =5a(4) =11a(5) =23a(6) =54a(7) =136a(8) =374a(9) =1103a(10) =3441a(11) =11186a(12) =37472a(13) =128325a(14) =446834a(15) =1576251a(16) =5618950a(17) =20204874a(18) =73190075a(19) =266810125a(20) =978044403a(21) =3602795670a(22) =13329486459a(23) =49509151332a(24) =184540129492a(25) =690061739789