The third self-composition of A120009; g.f.: A(x) = G(G(G(x))), where G(x) = g.f. of A120009.
A120012
The third self-composition of A120009; g.f.: A(x) = G(G(G(x))), where G(x) = g.f. of A120009.
Terms
- a(0) =1a(1) =3a(2) =9a(3) =24a(4) =42a(5) =-87a(6) =-1575a(7) =-12240a(8) =-77730a(9) =-449994a(10) =-2470278a(11) =-13101228a(12) =-67823484a(13) =-344888619a(14) =-1729791975a(15) =-8581375224a(16) =-42194252106a(17) =-205940062998a(18) =-998899022898
External references
- oeis: A120012