304569

Appears in sequences

• Number of (2+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=20A250814
• Number of unlabeled loopless multigraphs with n nodes of degree 4 or less.at n=9A333895