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.

A184181

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.