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

Terms

a(0) =2a(1) =5a(2) =12a(3) =31a(4) =74a(5) =184a(6) =442a(7) =1081a(8) =2604a(9) =6323a(10) =15250a(11) =36912a(12) =89074a(13) =215293a(14) =519660a(15) =1255223a(16) =3030106a(17) =7317032a(18) =17664170a(19) =42649553a(20) =102963276a(21) =248587051a(22) =600137378a(23) =1448890464a(24) =3497918306a(25) =8444802101a(26) =20387522508a(27) =49220043535a(28) =118827609578a(29) =286875776920