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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A047939 Number of 4-colorings of an n X n grid, up to rotational symmetry. 4
 1, 4, 70, 65824, 1073758336, 281474993496064, 1180591620734591303680, 79228162514264619068554215424, 85070591730234615870455337878516924416, 1461501637330902918203686041642102636484130504704, 401734511064747568885490523085607563280607806359022338048000 (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 = 4. CROSSREFS Column k=4 of A343095. Cf. A054751, A047937. Sequence in context: A184576 A367523 A162135 * A354859 A088693 A322397 Adjacent sequences: A047936 A047937 A047938 * A047940 A047941 A047942 KEYWORD nonn AUTHOR Rob Pratt EXTENSIONS Terms a(10) 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.

Last modified September 9 18:08 EDT 2024. Contains 375765 sequences. (Running on oeis4.)