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

Terms

a(0) =2a(1) =5a(2) =12a(3) =31a(4) =80a(5) =205a(6) =526a(7) =1350a(8) =3464a(9) =8889a(10) =22810a(11) =58532a(12) =150198a(13) =385420a(14) =989018a(15) =2537899a(16) =6512450a(17) =16711463a(18) =42882940a(19) =110041025a(20) =282373998a(21) =724594076a(22) =1859365870a(23) =4771280299a(24) =12243483684a(25) =31417750230a(26) =80620439004a(27) =206878440932a(28) =530866488090