p-INVERT of (0,1,0,1,0,1,...), where p(S) = (1 - S)(1 - 2 S)(1 - 3 S).

Terms

a(0) =6a(1) =25a(2) =96a(3) =351a(4) =1242a(5) =4304a(6) =14706a(7) =49761a(8) =167232a(9) =559303a(10) =1864110a(11) =6197472a(12) =20567262a(13) =68166713a(14) =225713280a(15) =746866143a(16) =2470077378a(17) =8166190192a(18) =26990599050a(19) =89190984033a(20) =294691499808a(21) =973574384231