p-INVERT of (1,1,1,1,1,...), where p(S) = (1 - S^3)^2.

Terms

a(0) =0a(1) =0a(2) =2a(3) =6a(4) =12a(5) =23a(6) =48a(7) =105a(8) =228a(9) =486a(10) =1026a(11) =2161a(12) =4548a(13) =9555a(14) =20026a(15) =41874a(16) =87384a(17) =182043a(18) =378648a(19) =786429a(20) =1631120a(21) =3378750a(22) =6990510a(23) =14447045a(24) =29826156a(25) =61516455a(26) =126761190a(27) =260978922a(28) =536870916a(29) =1103567983