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

Terms

a(0) =2a(1) =7a(2) =23a(3) =75a(4) =244a(5) =793a(6) =2576a(7) =8366a(8) =27167a(9) =88215a(10) =286439a(11) =930072a(12) =3019941a(13) =9805712a(14) =31838986a(15) =103380599a(16) =335674791a(17) =1089929347a(18) =3538978588a(19) =11490991649a(20) =37311016064a(21) =121148109014a(22) =393365440335