222556

Appears in sequences

• Number of symmetric foldings of a strip of n blank stamps.at n=25A001010
• 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 A381572.at n=43A381571
• G.f. A(x) satisfies A(x) = 1/(1 - x*A(x*A(x)))^2.at n=7A381572