p-INVERT of (1,1,1,0,0,0,0,0,0,0,0,...), where p(S) = (1 - S)^3.

Terms

a(0) =3a(1) =9a(2) =25a(3) =63a(4) =153a(5) =359a(6) =819a(7) =1830a(8) =4018a(9) =8694a(10) =18582a(11) =39298a(12) =82350a(13) =171186a(14) =353338a(15) =724719a(16) =1478061a(17) =2999175a(18) =6057687a(19) =12183945a(20) =24411935a(21) =48740193a(22) =96998325a(23) =192459996a(24) =380812692a(25) =751557756a(26) =1479686972a(27) =2906717460a(28) =5698014924a(29) =11147786740