login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A068247 1/6 the number of colorings of a 6 X 6 rhombic hexagonal array with n colors. 2
1, 123273728, 606966551329230, 42294602754348892160, 221621345837018832499375, 227499859288036192921814016, 76749554391225308000690033388, 11559255542512176814494743592960, 945121787128699657370828476884045, 47886238054762718784097603771840000 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,2

LINKS

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

Alois P. Heinz, Formula for A068247

FORMULA

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

CROSSREFS

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

Sequence in context: A172845 A172888 A172917 * A224780 A277057 A180408

Adjacent sequences:  A068244 A068245 A068246 * A068248 A068249 A068250

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 24 2002

EXTENSIONS

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

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified June 4 10:51 EDT 2020. Contains 334825 sequences. (Running on oeis4.)