200204

Appears in sequences

• Partial sums of walks of length n+1 on a tetrahedron A001998.at n=12A178778
• Number of n X n binary arrays with some 1 horizontally or vertically adjacent to some other 1 exactly once.at n=4A268734
• Number of nX5 binary arrays with some 1 horizontally or vertically adjacent to some other 1 exactly once.at n=4A268737
• T(n,k)=Number of nXk binary arrays with some 1 horizontally or vertically adjacent to some other 1 exactly once.at n=40A268740