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

Terms

a(0) =0a(1) =0a(2) =1a(3) =6a(4) =21a(5) =57a(6) =138a(7) =330a(8) =827a(9) =2175a(10) =5826a(11) =15519a(12) =40836a(13) =106584a(14) =277696a(15) =724968a(16) =1897380a(17) =4972113a(18) =13029534a(19) =34125561a(20) =89336141a(21) =233831262a(22) =612074526a(23) =1602358863a(24) =4195173507a(25) =10983645498a(26) =28756340047a(27) =75285234408a(28) =197097337248a(29) =516002648064