257050

Appears in sequences

• Half the number of n X 4 binary arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.at n=7A185830
• Half the number of nX8 binary arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.at n=3A185834
• Integers of the form k^2 + 1, where k >= 1, that are the product of two other integers of the form k^2 + 1, where k >= 1.at n=33A372496