p-INVERT of (1,1,1,1,1,...), where p(S) = (1 - S^3)^3.

Terms

a(0) =0a(1) =0a(2) =3a(3) =9a(4) =18a(5) =36a(6) =81a(7) =189a(8) =430a(9) =954a(10) =2097a(11) =4602a(12) =10080a(13) =21996a(14) =47796a(15) =103473a(16) =223308a(17) =480584a(18) =1031571a(19) =2208807a(20) =4718610a(21) =10058580a(22) =21398715a(23) =45438270a(24) =96313626a(25) =203812110a(26) =430615240a(27) =908455203a(28) =1913845374a(29) =4026531804