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A216790 Number of 4-colorings of a side-n hexagonal array with colors introduced in row major order 1
1, 11, 5318, 22831676, 915294166360, 348567447145791344 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 3 of A216792

LINKS

Table of n, a(n) for n=1..6.

EXAMPLE

Some solutions for n=3

......0.1.2..........0.1.2..........0.1.2..........0.1.2..........0.1.2

.....1.3.0.1........1.2.0.3........3.2.3.0........3.2.0.1........3.2.3.0

....3.2.1.2.0......0.3.1.2.1......2.0.1.2.1......2.0.3.2.3......2.1.0.2.1

.....0.3.0.3........1.0.3.0........3.2.0.3........1.2.0.1........0.2.1.3

......2.1.2..........3.1.2..........0.3.2..........0.1.3..........1.3.0

CROSSREFS

Sequence in context: A147668 A177804 A023334 * A068730 A257124 A208857

Adjacent sequences:  A216787 A216788 A216789 * A216791 A216792 A216793

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 16 2012

STATUS

approved

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Last modified December 5 12:24 EST 2021. Contains 349557 sequences. (Running on oeis4.)