21418808
domain: N
Appears in sequences
- Number of nX5 0..1 arrays with every element equal to 1, 2 or 3 horizontally or antidiagonally adjacent elements, with upper left element zero.at n=6A301948
- Number of 7Xn 0..1 arrays with every element equal to 1, 2 or 3 horizontally or antidiagonally adjacent elements, with upper left element zero.at n=4A301956