Number of nX3 0..3 arrays with every element neighboring horizontally or vertically both a 0 and a 1, and 2 introduced before 3 in row major order.

A204296

Number of nX3 0..3 arrays with every element neighboring horizontally or vertically both a 0 and a 1, and 2 introduced before 3 in row major order.

Terms

    a(0) =0a(1) =4a(2) =80a(3) =160a(4) =2816a(5) =19540a(6) =164112a(7) =1490212a(8) =13307116a(9) =115013704a(10) =1026915800a(11) =9058997060a(12) =80167041712a(13) =709913397236

External references