G.f. A(x) satisfies: A(A(x)) = x+x^2 + x*A(A(A(A(x)))).
A213009
G.f. A(x) satisfies: A(A(x)) = x+x^2 + x*A(A(A(A(x)))).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =5a(4) =21a(5) =125a(6) =825a(7) =6133a(8) =49925a(9) =439417a(10) =4142945a(11) =41544161a(12) =440710117a(13) =4924691541a(14) =57766255689a(15) =709205703565
External references
- oeis: A213009