Self-composition of the Pell numbers; g.f.: A(x) = G(G(x)), where G(x) = g.f. of A000129.

A279285

Self-composition of the Pell numbers; g.f.: A(x) = G(G(x)), where G(x) = g.f. of A000129.

Terms

    a(0) =0a(1) =1a(2) =4a(3) =18a(4) =82a(5) =377a(6) =1740a(7) =8045a(8) =37226a(9) =172314a(10) =797744a(11) =3693493a(12) =17101128a(13) =79180525a(14) =366618808a(15) =1697509962a(16) =7859781454a(17) =36392245541a(18) =168502887396a(19) =780199897985

External references