A216791 Number of 5-colorings of a side-n hexagonal array with colors introduced in row major order.

1, 31, 2976610, 39123956055580, 69275022816331822721697

Offset: 1

Author

R. H. Hardin Sep 16 2012

Keywords

• nonn

Comments

Column 4 of A216792

Examples

			Some solutions for n=3
......0.1.2..........0.1.2..........0.1.2..........0.1.0..........0.1.0
.....1.2.3.1........2.3.0.1........3.2.0.1........1.2.3.1........1.2.3.1
....0.3.0.2.0......3.0.2.3.0......2.1.3.2.0......2.3.0.2.3......2.3.0.2.3
.....1.2.1.3........1.3.0.1........3.0.1.3........1.2.3.0........1.2.3.1
......0.3.2..........2.1.2..........1.2.0..........3.1.2..........3.0.2