Number of (n+2)X9 0..1 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically or nw-to-se diagonally exactly two ways, and new values 0..1 introduced in row major order.

A206658

Number of (n+2)X9 0..1 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically or nw-to-se diagonally exactly two ways, and new values 0..1 introduced in row major order.

Terms

    a(0) =332419a(1) =4345011a(2) =67724531a(3) =1063970081a(4) =17082121522a(5) =278034719471

External references