1/128 the number of (n+2)X4 binary arrays with each 3X3 subblock trace equal to some horizontal or vertical neighbor 3X3 subblock trace.

A185986

1/128 the number of (n+2)X4 binary arrays with each 3X3 subblock trace equal to some horizontal or vertical neighbor 3X3 subblock trace.

Terms

    a(0) =10a(1) =76a(2) =722a(3) =6036a(4) =52966a(5) =462288a(6) =4038360a(7) =35286678a(8) =308300326a(9) =2693690508a(10) =23535373610a(11) =205633797210

External references