1/729 the number of (n+2)X5 0..2 arrays with each 3X3 subblock trace equal to some horizontal or vertical neighbor 3X3 subblock trace.

A186956

1/729 the number of (n+2)X5 0..2 arrays with each 3X3 subblock trace equal to some horizontal or vertical neighbor 3X3 subblock trace.

Terms

    a(0) =831a(1) =112707a(2) =5903759a(3) =373049827a(4) =22237406277

External references