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%I #9 May 03 2012 16:59:30
%S 1,4352,4294971392,961201829493850112,48781126844255370222607142912,
%T 561399464545957024370182236743498291167232,
%U 1465126373454769055363011684465705776628549543645731295232,867083863998912174882104147806181674429733314821142479758142332970286825472
%N 1/18 times the number of colorings of an n X n staggered hexagonal array with 18 colors.
%C Terms for rhombic- and staggered- hexagonal arrays are the same for n in 1..4.
%Y Cf. A068239-A068305, A000332, A002417, A027441, A212194, A212195.
%K nonn
%O 1,2
%A _R. H. Hardin_, Feb 24 2002
%E a(5)-a(8) from _Alois P. Heinz_, May 03 2012
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