807261

Appears in sequences

• Half the number of n X n binary arrays with the number of 1-1 adjacencies equal to the number of 0-0 adjacencies.at n=4A183248
• Half the number of n X 5 binary arrays with the number of 1-1 adjacencies equal to the number of 0-0 adjacencies.at n=4A183251
• T(n,k)=Half the number of nXk binary arrays with the number of 1-1 adjacencies equal to the number of 0-0 adjacencies.at n=40A183253