1683240

Appears in sequences

• Number of nX2 0..4 arrays with some element plus some horizontally or vertically adjacent neighbor totalling four exactly once.at n=4A270052
• Number of nX5 0..4 arrays with some element plus some horizontally or vertically adjacent neighbor totalling four exactly once.at n=1A270055
• T(n,k)=Number of nXk 0..4 arrays with some element plus some horizontally or vertically adjacent neighbor totalling four exactly once.at n=16A270058
• T(n,k)=Number of nXk 0..4 arrays with some element plus some horizontally or vertically adjacent neighbor totalling four exactly once.at n=19A270058