G.f. A(x) satisfies A(x) = 1/( 1 - x * (1+x)^2 * A(x) )^2.
A382893
G.f. A(x) satisfies A(x) = 1/( 1 - x * (1+x)^2 * A(x) )^2.
Terms
- a(0) =1a(1) =2a(2) =11a(3) =60a(4) =365a(5) =2350a(6) =15767a(7) =109048a(8) =771993a(9) =5567066a(10) =40751267a(11) =302018484a(12) =2261763205a(13) =17088919814a(14) =130108591407a(15) =997225521136
External references
- oeis: A382893