login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A047942 Number of 7-colorings of an n X n grid, up to rotational symmetry. 3
1, 7, 616, 10092775, 8308234084801, 335267154940213889575, 662932711464913775048175499816, 64230894380264719522488136461023341060807, 304940121908958925034643465916849873749900601574419201, 70938377295002676956115265690779190293441720530070400876280330568007 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Andrew Howroyd, Table of n, a(n) for n = 0..25

FORMULA

a(n) = (m^(n^2) + 2 m^((n^2 + 3 (n mod 2))/4) + m^((n^2 + (n mod 2))/2))/4, with m = 7.

CROSSREFS

Column k=7 of A343095.

Cf. A047937.

Sequence in context: A261532 A295814 A087772 * A319033 A182346 A333741

Adjacent sequences:  A047939 A047940 A047941 * A047943 A047944 A047945

KEYWORD

nonn

AUTHOR

Rob Pratt

EXTENSIONS

Terms a(8) and beyond from Andrew Howroyd, Apr 14 2021

STATUS

approved

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified October 5 20:00 EDT 2022. Contains 357261 sequences. (Running on oeis4.)