Recip transform of 2*(1 + x^3 + x^4 + x^5 + x^6)-1/(1-x).

Terms

a(0) =1a(1) =1a(2) =3a(3) =9a(4) =31a(5) =111a(6) =413a(7) =1573a(8) =6099a(9) =23959a(10) =95061a(11) =380043a(12) =1528197a(13) =6171985a(14) =25007283a(15) =101550555a(16) =412959045a(17) =1680406133a(18) =6837586143a(19) =27802552381a(20) =112895001739a(21) =457488768507