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A068253 1/3 of the number of colorings of an n X n square array with 3 colors. 3
1, 6, 82, 2604, 193662, 33865632, 13956665236, 13574876544396, 31191658416342674, 169426507164530254380, 2176592549084872196370724, 66158464020552857153017287240 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..12.

FORMULA

For formula see A078099.

CROSSREFS

Cf. A068239-A068305, A000332, A002417, A027441, A182368, A182406.

See A047938 for number of improper colorings.

Main diagonal of A078099.

Sequence in context: A089397 A089701 A251584 * A188806 A155811 A239170

Adjacent sequences:  A068250 A068251 A068252 * A068254 A068255 A068256

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 24 2002

EXTENSIONS

More terms from Vladeta Jovovic, Jul 22 2004

a(11)-a(12) from Alois P. Heinz, Mar 25 2009

STATUS

approved

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Last modified March 29 15:31 EDT 2017. Contains 284273 sequences.