1692480

Appears in sequences

• Summed lengths of nonintersecting rook paths on a 5 X n board.at n=5A181396
• Summed lengths of nonintersecting rook paths on a 6 X n board.at n=4A181397
• Summed lengths of nonintersecting rook paths on an n X k board (square array by antidiagonals).at n=49A181399
• Summed lengths of nonintersecting rook paths on an n X k board (square array by antidiagonals).at n=50A181399