568128

Appears in sequences

• Triangular array read by rows: The sum of squares of the number of common points in all pairs of lattice paths from (0,0) to (x,y), for 0 <= y <= x (the unnormalized second moment).at n=31A306687
• -a(n)/7! is the coefficient of x^7 in the Taylor expansion of the k-th iteration of sin(x).at n=22A366827