A068247 1/6 the number of colorings of a 6 X 6 rhombic hexagonal array with n colors.

1, 123273728, 606966551329230, 42294602754348892160, 221621345837018832499375, 227499859288036192921814016, 76749554391225308000690033388, 11559255542512176814494743592960, 945121787128699657370828476884045, 47886238054762718784097603771840000

Offset: 3

Author

R. H. Hardin, Feb 24 2002

Keywords

• nonn

Links

• Alois P. Heinz, Table of n, a(n) for n = 3..1000
• Alois P. Heinz, Formula for A068247

Crossrefs

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

Formula

a(n) = A212163(n,6)/6. - Alois P. Heinz, Dec 20 2012

Extensions

Extended beyond a(7) by Alois P. Heinz, May 02 2012