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

Terms

a(0) =0a(1) =3a(2) =12a(3) =37a(4) =116a(5) =372a(6) =1188a(7) =3763a(8) =11860a(9) =37261a(10) =116760a(11) =365056a(12) =1139224a(13) =3549635a(14) =11045804a(15) =34335421a(16) =106633804a(17) =330916268a(18) =1026277180a(19) =3181108619a(20) =9855901108a(21) =30524529485a(22) =94506627952a(23) =292521594048a(24) =905220237168