270900

Appears in sequences

• LCM of Stirling numbers of the second kind, S(n,k) for 1 <= k <= n; S(n,k) = number of partitions of {1,2,...,n} with k blocks.at n=6A063040
• Denominator of sum{k=1 to n} 1/S(n,k), where S(n,k) is a Stirling number of the second kind.at n=6A112291
• a(n) = 3*(n + 1)*(n + 2)*(3*n + 1)*(3*n + 4)/4.at n=13A268685
• Number of simple disconnected weakly perfect graphs on n vertices.at n=9A287023
• Triangle read by rows: T(n,k) is the number of oriented colorings of the facets of a regular n-dimensional orthotope using exactly k colors. Row n has 2n columns.at n=39A325008