Number of n X n binary matrices with every 1 vertically or horizontally adjacent to some 0.

A133515

Number of n X n binary matrices with every 1 vertically or horizontally adjacent to some 0.

Terms

    a(0) =1a(1) =11a(2) =291a(3) =28661a(4) =10982565a(5) =16031828359

External references