Number of nX4 0..3 arrays with all horizontally or vertically connected equal values in a straight line, and new values 0..3 introduced in row major order.
A223058
Number of nX4 0..3 arrays with all horizontally or vertically connected equal values in a straight line, and new values 0..3 introduced in row major order.
Terms
- a(0) =15a(1) =1473a(2) =213469a(3) =31331820a(4) =4606719559a(5) =677531592132
External references
- oeis: A223058