G.f.: A(x) = 1 + G(G(G(x))), where G(x) = x + x*G(G(x)) is the g.f. of A030266.
A128326
G.f.: A(x) = 1 + G(G(G(x))), where G(x) = x + x*G(G(x)) is the g.f. of A030266.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =12a(4) =57a(5) =305a(6) =1787a(7) =11269a(8) =75629a(9) =535960a(10) =3987913a(11) =31021693a(12) =251445581a(13) =2117993712a(14) =18499513147a(15) =167246537937
External references
- oeis: A128326