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A068268 1/18 the number of colorings of an n X n square array with 18 colors. 1
1, 4641, 5554571857, 1714419367669298289, 136461767759964622690609683537, 2801124263786734144622842493797034683405617, 14827953377838619886793709359009173477911476430325930106481, 20242190237452646688395985657256161903754274932459524235140863308223305109841 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..8.

CROSSREFS

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

Sequence in context: A031566 A236815 A233855 * A227482 A028551 A031615

Adjacent sequences:  A068265 A068266 A068267 * A068269 A068270 A068271

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 24 2002

EXTENSIONS

a(5)-a(8) from Alois P. Heinz, Apr 27 2012

STATUS

approved

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Last modified March 28 07:59 EDT 2020. Contains 333079 sequences. (Running on oeis4.)