Number of defective 4-colorings of an n X n 0..3 array connected horizontally, antidiagonally and vertically with exactly two mistakes, and colors introduced in row-major 0..3 order.
A229664
Number of defective 4-colorings of an n X n 0..3 array connected horizontally, antidiagonally and vertically with exactly two mistakes, and colors introduced in row-major 0..3 order.
Terms
- a(0) =0a(1) =4a(2) =1555a(3) =328160a(4) =78681904a(5) =29775277216
External references
- oeis: A229664