Number of nX6 binary arrays with some 1 horizontally or vertically adjacent to some other 1 exactly once.

A268738

Number of nX6 binary arrays with some 1 horizontally or vertically adjacent to some other 1 exactly once.

Terms

    a(0) =20a(1) =420a(2) =7831a(3) =128232a(4) =1971414a(5) =29134076a(6) =418632185a(7) =5894815754a(8) =81718671716

External references