255406

Appears in sequences

• Number of n X n 0..1 arrays with every element equal to 0, 1 or 3 horizontally or vertically adjacent elements, with upper left element zero.at n=6A301535
• Number of nX7 0..1 arrays with every element equal to 0, 1 or 3 horizontally or vertically adjacent elements, with upper left element zero.at n=6A301540