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

Terms

a(0) =2a(1) =6a(2) =18a(3) =56a(4) =168a(5) =510a(6) =1544a(7) =4680a(8) =14176a(9) =42952a(10) =130128a(11) =394252a(12) =1194456a(13) =3618840a(14) =10963960a(15) =33217424a(16) =100638528a(17) =304903688a(18) =923764032a(19) =2798719872a(20) =8479257216a(21) =25689531840a(22) =77831351040a(23) =235804967056a(24) =714416256800