Expansion of g/(1 + x^2*g^2), where g = 1+x*g^3 is the g.f. of A001764.

A387677

Expansion of g/(1 + x^2*g^2), where g = 1+x*g^3 is the g.f. of A001764.

Terms

    a(0) =1a(1) =1a(2) =2a(3) =9a(4) =44a(5) =223a(6) =1179a(7) =6447a(8) =36170a(9) =207052a(10) =1204619a(11) =7102443a(12) =42345383a(13) =254865404a(14) =1546474802a(15) =9450106041a(16) =58104962436a(17) =359219139953

External references