210876

Appears in sequences

• Number of n X n symmetric binary matrices containing no more than one 1 in any 3 X 3 sub-block.at n=11A139009
• Number of (3+1) X (n+1) 0..2 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing min(x(i,j),x(i-1,j)) in the j direction.at n=12A250815