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

Terms

a(0) =1a(1) =1a(2) =3a(3) =9a(4) =33a(5) =127a(6) =519a(7) =2191a(8) =9509a(9) =42109a(10) =189571a(11) =864865a(12) =3989877a(13) =18580355a(14) =87227311a(15) =412371551a(16) =1961485449a(17) =9380593513a(18) =45078031763a(19) =217555637193