83800

Appears in sequences

• Smallest positive number of "triangular" shuffles of n(n+1)/2 cards needed to restore them to their original order.at n=34A122158
• Number of n X 4 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 1 and 1 0 1 vertically.at n=19A207449