74624

Appears in sequences

• Square array read by antidiagonals giving number of binary trees of height n with k points on the n-th level (n,k>0).at n=40A065329
• Coefficients of polynomials (in descending powers of x) P(n,x) := 1 + P(n-1,x)^2, where P(1,x) = x + 1.at n=30A158985
• Number of order-preserving or order-reversing full contraction mappings (of an n-chain) with exactly 1 fixed point.at n=13A221880
• Irregular triangular array, read by rows: row n shows the coefficients of the polynomial p(n,x) defined in Comments.at n=25A329429