Number of n X n binary matrices with every 1 adjacent to another 1 horizontally or vertically.

A134262

Number of n X n binary matrices with every 1 adjacent to another 1 horizontally or vertically.

Terms

    a(0) =1a(1) =10a(2) =250a(3) =22946a(4) =8222576a(5) =11168045764

External references