Expansion of g^2/(1 - x^3*g^4), where g = 1+x*g^3 is the g.f. of A001764.

A391130

Expansion of g^2/(1 - x^3*g^4), where g = 1+x*g^3 is the g.f. of A001764.

Terms

    a(0) =1a(1) =2a(2) =7a(3) =31a(4) =149a(5) =761a(6) =4059a(7) =22348a(8) =126064a(9) =724850a(10) =4232694a(11) =25033450a(12) =149646521a(13) =902736714a(14) =5488516397a(15) =33597424528a(16) =206896370434

External references