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

Terms

a(0) =4a(1) =11a(2) =30a(3) =79a(4) =202a(5) =508a(6) =1262a(7) =3109a(8) =7614a(9) =18569a(10) =45152a(11) =109560a(12) =265448a(13) =642463a(14) =1553790a(15) =3755843a(16) =9075302a(17) =21923060a(18) =52949458a(19) =127869209a(20) =308767326a(21) =745537309a(22) =1800065788a(23) =4346043888a(24) =10492781068a(25) =25332654899a(26) =61159842270a(27) =147655261111a(28) =356475233986