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)^2*x^n.
A172390
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)^2*x^n.
Terms
- a(0) =1a(1) =8a(2) =24a(3) =0a(4) =-168a(5) =0a(6) =2112a(7) =0a(8) =-32040a(9) =0a(10) =536256a(11) =0a(12) =-9542976a(13) =0a(14) =177126912a(15) =0a(16) =-3390361128a(17) =0a(18) =66436117440a(19) =0a(21) =0a(23) =0a(25) =0a(27) =0a(29) =0
External references
- oeis: A172390