G.f. satisfies: A(x) = (1 + x*A(x))^2 * (1 + A(x)) / 2.
A228966
G.f. satisfies: A(x) = (1 + x*A(x))^2 * (1 + A(x)) / 2.
Terms
- a(0) =1a(1) =4a(2) =26a(3) =208a(4) =1858a(5) =17764a(6) =177842a(7) =1840672a(8) =19536546a(9) =211483556a(10) =2325884778a(11) =25915289008a(12) =291914007042
External references
- oeis: A228966