G.f. satisfies: A(x) = G(x/A(x))^2 and G(x)^2 = A(x*G(x)^2) where G(x) = Sum_{n>=0} C(2*n,n)*C(2*n+2,n+1)/(n+2)*x^n is the g.f. of A172392.
A172391
G.f. satisfies: A(x) = G(x/A(x))^2 and G(x)^2 = A(x*G(x)^2) where G(x) = Sum_{n>=0} C(2*n,n)*C(2*n+2,n+1)/(n+2)*x^n is the g.f. of A172392.
Terms
- a(0) =1a(1) =8a(2) =12a(3) =0a(4) =28a(5) =0a(6) =264a(7) =0a(8) =3720a(9) =0a(10) =63840a(11) =0a(12) =1232432a(13) =0a(14) =25731216a(15) =0a(16) =568130552a(17) =0a(18) =13081215840a(19) =0a(20) =311178567648a(21) =0a(23) =0a(25) =0a(27) =0a(29) =0a(31) =0
External references
- oeis: A172391