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1/6 the number of colorings of a 6 X 6 rhombic hexagonal array with n colors.
2

%I #13 Dec 20 2012 17:29:26

%S 1,123273728,606966551329230,42294602754348892160,

%T 221621345837018832499375,227499859288036192921814016,

%U 76749554391225308000690033388,11559255542512176814494743592960,945121787128699657370828476884045,47886238054762718784097603771840000

%N 1/6 the number of colorings of a 6 X 6 rhombic hexagonal array with n colors.

%H Alois P. Heinz, <a href="/A068247/b068247.txt">Table of n, a(n) for n = 3..1000</a>

%H Alois P. Heinz, <a href="/A068247/a068247.txt">Formula for A068247</a>

%F a(n) = A212163(n,6)/6. - _Alois P. Heinz_, Dec 20 2012

%Y Cf. A068239-A068305, A000332, A002417, A027441, A212162, A212163.

%K nonn

%O 3,2

%A _R. H. Hardin_, Feb 24 2002

%E Extended beyond a(7) by _Alois P. Heinz_, May 02 2012