Expansion of g^2/(1 - x^2*g), where g = 1+x*g^3 is the g.f. of A001764.
A391122
Expansion of g^2/(1 - x^2*g), where g = 1+x*g^3 is the g.f. of A001764.
Terms
- a(0) =1a(1) =2a(2) =8a(3) =33a(4) =156a(5) =787a(6) =4168a(7) =22839a(8) =128408a(9) =736537a(10) =4292990a(11) =25353172a(12) =151380355a(13) =912316895a(14) =5542296591a(15) =33903459311a(16) =208658476638
External references
- oeis: A391122