G.f. satisfies A(x) = 1/(1 - x/(1 - x*A(x))^2)^4.
A349021
G.f. satisfies A(x) = 1/(1 - x/(1 - x*A(x))^2)^4.
Terms
- a(0) =1a(1) =4a(2) =18a(3) =104a(4) =671a(5) =4624a(6) =33342a(7) =248412a(8) =1897219a(9) =14774152a(10) =116864936a(11) =936390692a(12) =7584216152a(13) =61992689940a(14) =510728310716
External references
- oeis: A349021