362799

Appears in sequences

• a(n) = n! - n^2.at n=9A005008
• Triangle read by rows: T(n,k) is the number of permutations of {1,2,...,n} whose shortest block is of length k (1 <= k <= n). A block of a permutation is a maximal sequence of consecutive integers which appear in consecutive positions. For example, the permutation 4512367 has 3 blocks: 45, 123, and 67. Its shortest block has length 2.at n=36A184180
• Number of permutations of {1,2,...,n} whose shortest block is of length 1. A block of a permutation is a maximal sequence of consecutive integers which appear in consecutive positions. For example, the permutation 5412367 has 4 blocks: 5, 4, 123, and 67. Its shortest block has length 1.at n=9A184181