G.f. satisfies A(x) = exp( Sum_{k>=1} A(x^k) * (3*x)^k/k ).

A363439

G.f. satisfies A(x) = exp( Sum_{k>=1} A(x^k) * (3*x)^k/k ).

Terms

    a(0) =1a(1) =3a(2) =18a(3) =108a(4) =702a(5) =4698a(6) =32913a(7) =236844a(8) =1747170a(9) =13131639a(10) =100239444a(11) =774932832a(12) =6055105590a(13) =47742847875a(14) =379381851684

External references