1/8192 the number of (n+2)X6 0..3 arrays with each 3X3 subblock trace equal to some horizontal or vertical neighbor 3X3 subblock trace.

A186550

1/8192 the number of (n+2)X6 0..3 arrays with each 3X3 subblock trace equal to some horizontal or vertical neighbor 3X3 subblock trace.

Terms

    a(0) =168200a(1) =88662978a(2) =31976088817

External references