A068283 1/4 the number of colorings of an n X n staggered hexagonal array with 4 colors.

1, 12, 264, 11424, 1009608, 185900256, 71883991272, 58646051219616, 101273697848025960, 370689919380760915680, 2880341312871966116331528, 47562687666338563715921774496

Offset: 1

Author

R. H. Hardin, Feb 24 2002

Keywords

• nonn

Comments

Terms for rhombic- and staggered- hexagonal arrays are the same for n in 1..4.

Crossrefs

Cf. A068239-A068305, A000332, A002417, A027441, A212194, A212195.

Extensions

a(9) from Alois P. Heinz, May 03 2012

a(10)-a(12) from Sean A. Irvine, Feb 07 2024