G.f. satisfies A(x) = (1 + x*A(x))^3 * (1 + x*A(x)^2).
A274735
G.f. satisfies A(x) = (1 + x*A(x))^3 * (1 + x*A(x)^2).
Terms
- a(0) =1a(1) =4a(2) =26a(3) =210a(4) =1901a(5) =18445a(6) =187524a(7) =1971672a(8) =21263360a(9) =233907762a(10) =2614446624a(11) =29607343948a(12) =338977591904
External references
- oeis: A274735