G.f. A(x) satisfies A(x) = Sum_{n>=0} x^(n^2) * A(x)^(2*n) / Product_{k=1..n} (1 - x^k*A(x))^2.
A206639
G.f. A(x) satisfies A(x) = Sum_{n>=0} x^(n^2) * A(x)^(2*n) / Product_{k=1..n} (1 - x^k*A(x))^2.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =18a(4) =91a(5) =489a(6) =2751a(7) =15985a(8) =95218a(9) =578324a(10) =3568084a(11) =22299964a(12) =140885754a(13) =898292262a(14) =5772951668a(15) =37355908797a(16) =243184468271
External references
- oeis: A206639