307875

Appears in sequences

• Number T(n,k) of permutations p of [n] having at least one index i with |p(i)-i| = k; triangle T(n,k), n>=1, 0<=k<=n-1, read by rows.at n=37A306506
• Number of permutations p of [n] having at least one index i with |p(i)-i| = 1.at n=9A306511