G.f. satisfies: A(x) = exp( Sum_{n>=1} x^n*A(x)^n/n * Sum_{k=0..2*n} A084606(n,k)^2 * x^k * A(x)^(2*k) ), where A084606(n,k) = [x^k] (1 + 2*x + 2*x^2)^n.
A218298
G.f. satisfies: A(x) = exp( Sum_{n>=1} x^n*A(x)^n/n * Sum_{k=0..2*n} A084606(n,k)^2 * x^k * A(x)^(2*k) ), where A084606(n,k) = [x^k] (1 + 2*x + 2*x^2)^n.
Terms
- a(0) =1a(1) =1a(2) =6a(3) =37a(4) =274a(5) =2154a(6) =17896a(7) =153981a(8) =1361702a(9) =12297022a(10) =112935652a(11) =1051549970a(12) =9903781784a(13) =94183796404a(14) =903135799468
External references
- oeis: A218298