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

Terms

a(0) =0a(1) =0a(2) =2a(3) =12a(4) =42a(5) =115a(6) =288a(7) =738a(8) =2020a(9) =5751a(10) =16362a(11) =45697a(12) =125538a(13) =342318a(14) =933050a(15) =2547630a(16) =6960042a(17) =18990309a(18) =51699042a(19) =140439411a(20) =380871538a(21) =1031705466a(22) =2792009100a(23) =7548723827a(24) =20389716864a(25) =55020917232a(26) =148334534420a(27) =399562167420