435120

Appears in sequences

• G.f. A(x) satisfies A(x) = 1 + x*A(x*A(x))^2.at n=9A143426
• Regular triangle where T(n,k) is the number of pairs of set partitions of {1,...,n} with join {{1,...,n}} and meet of length k.at n=39A318390
• Triangular array read by rows. T(n,k) is the number of Green's H-classes of rank k in the semigroup of partial transformations, n >= 0, 0 <= k <= n.at n=39A363849
• Square array A(n,k), n >= 0, k >= 0, read by antidiagonals downwards, where column k is the expansion of B(x)^k, where B(x) is the g.f. of A143426.at n=64A384626