109620

Appears in sequences

• a(n) = n*(n+1)*(n+2)*(n+3)/6.at n=27A033488
• Number of permutations in the symmetric group S_n that have exactly one transposition in their cycle decomposition.at n=8A088436
• Triangle T(n,k) = number of permutations of n elements with k 2-cycles.at n=26A114320
• a(n) = (9/2)*(n-1)*(n-2)*(n-3).at n=30A134171
• Number of (n+2) X 4 binary arrays with consecutive windows of three bits considered as a binary number nondecreasing in every row and column.at n=18A202455
• 9*n analog to Keith numbers.at n=22A282764
• Number T(n,k) of colored set partitions of [n] where exactly k colors are used for the elements; triangle T(n,k), n>=0, 0<=k<=n, read by rows.at n=24A323099