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

1, 31, 2976610, 39123956055580, 69275022816331822721697

Offset

1,2

Comments

Column 4 of A216792

Links

Table of n, a(n) for n=1..5.

Example

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

Crossrefs

Sequence in context: A079595 A051155 A342118 * A324268 A145210 A091308

Adjacent sequences: A216788 A216789 A216790 * A216792 A216793 A216794

Keyword

nonn

Author

R. H. Hardin Sep 16 2012

Status

approved