G.f. A(x) satisfies: A(x) = x + B(x)*C(x), where B(x) = x + 2*C(x)*A(x) and C(x) = x + 3*B(x)*A(x).
A229811
G.f. A(x) satisfies: A(x) = x + B(x)*C(x), where B(x) = x + 2*C(x)*A(x) and C(x) = x + 3*B(x)*A(x).
Terms
- a(0) =1a(1) =1a(2) =5a(3) =23a(4) =121a(5) =673a(6) =3953a(7) =23891a(8) =148321a(9) =938257a(10) =6031565a(11) =39273839a(12) =258529513a(13) =1717533025a(14) =11501168105a(15) =77546905595a(16) =526026614209
External references
- oeis: A229811