419900

Appears in sequences

• a(n) = n*(n+1)*(2*n+1)*(3*n+1)/6.at n=25A011195
• Number of ordered set partitions of {1,...,n} into n-1 blocks avoiding the pattern 123.at n=10A220101
• Stepped path in P(k,n) array of k-th partial sums of squares (A000290).at n=18A259775
• 12-dimensional square numbers.at n=9A266561
• Triangle read by rows: T(n, k) = k*(n - k)*binomial(2*n+2, 2*k+1)/(4*n + 2) for 1 <= k <= n-1.at n=40A375853