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

Terms

a(0) =2a(1) =5a(2) =14a(3) =39a(4) =106a(5) =290a(6) =794a(7) =2173a(8) =5946a(9) =16272a(10) =44530a(11) =121860a(12) =333480a(13) =912597a(14) =2497400a(15) =6834349a(16) =18702782a(17) =51181767a(18) =140063294a(19) =383295214a(20) =1048920220a(21) =2870460125a(22) =7855260268a(23) =21496593296a(24) =58827270844a(25) =160985870984a(26) =440551640160