522387

Appears in sequences

• Triangle T(n,k) read by rows: T(n,k) = (k-1)*T(n-1,k) + (n-k+2)*T(n-1, k-1), with T(n,1)=1, for 1 <= k <= n, n >= 1.at n=52A157011
• The numbers of a square spiral with 1 in the center, lying at integer points of the right branch of the parabola y=n^2.at n=19A357281