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

Terms

a(0) =0a(1) =0a(2) =0a(3) =1a(4) =8a(5) =36a(6) =120a(7) =331a(8) =808a(9) =1852a(10) =4248a(11) =10312a(12) =26968a(13) =74012a(14) =204968a(15) =558253a(16) =1483336a(17) =3860588a(18) =9938488a(19) =25570103a(20) =66214096a(21) =172926104a(22) =454504816a(23) =1197527184a(24) =3152221296a(25) =8275051544a(26) =21663395536a(27) =56615219385a(28) =147898879304a(29) =386593228980