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

 

Logo

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A223371 3X3 square grid graph coloring a rectangular array: number of n X n 0..8 arrays where 0..8 label nodes of the square grid graph and every array movement to a horizontal or vertical neighbor moves along an edge of this graph 1
9, 144, 13232, 6443888, 16589428016, 225311165173648, 16140699524652927296, 6098229223691941744426928, 12151193017016158174782862182736, 127692018720217712216017457942508673456 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A223379

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..11

EXAMPLE

Some solutions for n=3

..2..1..4....1..4..5....4..1..4....4..3..6....4..3..4....1..4..1....8..7..8

..1..4..1....2..5..4....7..4..5....1..4..7....7..4..5....4..3..4....5..8..5

..4..5..2....5..8..7....4..5..4....2..5..4....4..5..8....3..4..1....8..7..8

Vertex neighbors:

0 -> 1 3

1 -> 0 2 4

2 -> 1 5

3 -> 0 4 6

4 -> 3 1 5 7

5 -> 4 2 8

6 -> 3 7

7 -> 6 4 8

8 -> 7 5

CROSSREFS

Sequence in context: A162993 A094594 A173213 * A046529 A331329 A064091

Adjacent sequences:  A223368 A223369 A223370 * A223372 A223373 A223374

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 19 2013

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 December 5 06:52 EST 2021. Contains 349543 sequences. (Running on oeis4.)