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

Terms

a(0) =4a(1) =14a(2) =48a(3) =159a(4) =512a(5) =1618a(6) =5036a(7) =15491a(8) =47192a(9) =142624a(10) =428144a(11) =1277884a(12) =3795208a(13) =11222716a(14) =33060072a(15) =97060033a(16) =284095940a(17) =829298422a(18) =2414859016a(19) =7016265637a(20) =20344112608a(21) =58879534286a(22) =170117201548a(23) =490736173432