The third self-composition of A120010; g.f.: A(x) = G(G(G(x))), where G(x) = g.f. of A120010.
A120018
The third self-composition of A120010; g.f.: A(x) = G(G(G(x))), where G(x) = g.f. of A120010.
Terms
- a(0) =1a(1) =3a(2) =9a(3) =30a(4) =114a(5) =480a(6) =2157a(7) =10092a(8) =48525a(9) =238143a(10) =1187952a(11) =6006171a(12) =30710553a(13) =158535975a(14) =825143145a(15) =4325320191a(16) =22814398392a(17) =120999555588a(18) =644878190175
External references
- oeis: A120018