The 2nd self-composition of A120010; g.f.: A(x) = G(G(x)), where G(x) = g.f. of A120010.
A120017
The 2nd self-composition of A120010; g.f.: A(x) = G(G(x)), where G(x) = g.f. of A120010.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =10a(4) =32a(5) =116a(6) =440a(7) =1708a(8) =6760a(9) =27232a(10) =111392a(11) =461536a(12) =1933024a(13) =8170400a(14) =34807232a(15) =149304080a(16) =644298592a(17) =2795216576a(18) =12184415360a(19) =53338632256a(20) =234393350912
External references
- oeis: A120017