423595

Appears in sequences

• Number of polyhexes with n cells that tile the plane by 180-degree rotation (Conway criterion).at n=13A075211
• Number of n X n 0..2 arrays with the row and column sums nondecreasing.at n=3A203323
• Number of nX4 0..2 arrays with the row and column sums nondecreasing.at n=3A203326
• T(n,k)=Number of nXk 0..2 arrays with the row and column sums nondecreasing.at n=24A203330