G.f. satisfies: A(x) = C(x)*A(x^3*C(x)^4), where C(x) is the g.f. of the Catalan numbers (A000108).

A120900

G.f. satisfies: A(x) = C(x)*A(x^3*C(x)^4), where C(x) is the g.f. of the Catalan numbers (A000108).

Terms

    a(0) =1a(1) =1a(2) =2a(3) =6a(4) =19a(5) =62a(6) =209a(7) =722a(8) =2539a(9) =9054a(10) =32654a(11) =118876a(12) =436171a(13) =1611067a(14) =5984943a(15) =22344455a(16) =83786875a(17) =315397144a(18) =1191324649a(19) =4513742858a(20) =17149228138a(21) =65318912291a(22) =249356597492a(23) =953902701488

External references