214660

Appears in sequences

• Number of monomer-dimer tatami tilings (no four tiles meet) of the n X n grid with n monomers and equal numbers of vertical and horizontal dimers, up to rotational symmetry.at n=22A182107
• a(n) = A182107(4n).at n=5A226300
• Number of (n+1) X (6+1) 0..1 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing x(i,j)-x(i-1,j) in the j direction.at n=10A250609