654030

Appears in sequences

• Number of permutations that are n-3 "block reversals" away from 12...n.at n=7A007974
• Triangle read by rows: T(n, k) = number of permutations that are k "block reversals" away from 12...n, for n >= 0, and (for n>0) 0 <= k <= n-1.at n=53A300003