Expansion of 1/(g * (2-g))^3, where g = 1+x*g^2 is the g.f. of A000108.

Terms

a(0) =1a(1) =0a(2) =3a(3) =12a(4) =48a(5) =192a(6) =769a(7) =3084a(8) =12381a(9) =49744a(10) =199977a(11) =804276a(12) =3235668a(13) =13020192a(14) =52400538a(15) =210909656a(16) =848950359a(17) =3417275616a(18) =13755595689a(19) =55369756356a(20) =222871001064a(21) =897051906816