p-INVERT of the positive integers, where p(S) = 1 - S^2 - S^4.

Terms

a(0) =0a(1) =1a(2) =4a(3) =12a(4) =36a(5) =110a(6) =332a(7) =983a(8) =2876a(9) =8380a(10) =24428a(11) =71357a(12) =208868a(13) =612178a(14) =1795228a(15) =5264684a(16) =15436060a(17) =45248195a(18) =132616392a(19) =388652536a(20) =1138993032a(21) =3338020181a(22) =9782903524a(23) =28671786116a(24) =84032220964a(25) =246284956558a(26) =721820483900