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A068268 1/18 the number of colorings of an n X n square array with 18 colors. 1

%I

%S 1,4641,5554571857,1714419367669298289,136461767759964622690609683537,

%T 2801124263786734144622842493797034683405617,

%U 14827953377838619886793709359009173477911476430325930106481,20242190237452646688395985657256161903754274932459524235140863308223305109841

%N 1/18 the number of colorings of an n X n square array with 18 colors.

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

%K nonn

%O 1,2

%A _R. H. Hardin_, Feb 24 2002

%E a(5)-a(8) from _Alois P. Heinz_, Apr 27 2012

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Last modified June 4 01:54 EDT 2020. Contains 334812 sequences. (Running on oeis4.)