146048

Appears in sequences

• The number of sigma-admissible subsets of {1,2,...,n} as defined by Marzuola-Miller.at n=29A158449
• Number of 4-turn rook's tours on an n X n board summed over all starting positions.at n=7A187191
• Number of (n+1) X (5+1) 0..2 arrays colored with the upper median value of each 2 X 2 subblock.at n=14A235951
• Triangle read by rows: T(n,k) is the number of subpermutations of an n-set, whose orbits are each of size at most k with at least one orbit of size exactly k, and without fixed points. Equivalently, T(n,k) is the number of partial derangements of an n-set each of whose orbits is of size at most k with at least one orbit of size exactly k, and without fixed points.at n=39A261765