G.f. satisfies: A(x) = exp( Sum_{n>=1} x^n*A(x)^n/n * Sum_{k=0..2*n} A200536(n,k)^2 * x^k * A(x)^(2*k) ), where A200536(n,k) = [x^k] (1 + 3*x + 2*x^2)^n.
A218619
G.f. satisfies: A(x) = exp( Sum_{n>=1} x^n*A(x)^n/n * Sum_{k=0..2*n} A200536(n,k)^2 * x^k * A(x)^(2*k) ), where A200536(n,k) = [x^k] (1 + 3*x + 2*x^2)^n.
Terms
- a(0) =1a(1) =1a(2) =11a(3) =72a(4) =734a(5) =6994a(6) =74641a(7) =803196a(8) =8989482a(9) =102192197a(10) =1184211027a(11) =13897707080a(12) =165052834584
External references
- oeis: A218619