G.f. satisfies A(x) = 1 + x*A(x)*(1 + 2*A(x)^3).
A364431
G.f. satisfies A(x) = 1 + x*A(x)*(1 + 2*A(x)^3).
Terms
- a(0) =1a(1) =3a(2) =27a(3) =351a(4) =5319a(5) =87885a(6) =1535517a(7) =27898101a(8) =521740197a(9) =9977087439a(10) =194191054263
External references
- oeis: A364431