121524

Appears in sequences

• Number of ways to place a non-attacking white and black bishop on n X n chessboard.at n=18A035288
• Equal divisions of the octave of decreasing eleven-limit Pepper ambiguity.at n=16A117557
• Number of 7 X n 0..1 arrays with every element equal to 0 or 1 horizontally or antidiagonally adjacent elements, with upper left element zero.at n=18A301796