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!)
A223372 3X3 square grid graph coloring a rectangular array: number of nX1 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, 24, 68, 192, 544, 1536, 4352, 12288, 34816, 98304, 278528, 786432, 2228224, 6291456, 17825792, 50331648, 142606336, 402653184, 1140850688, 3221225472, 9126805504, 25769803776, 73014444032, 206158430208, 584115552256 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 1 of A223379
LINKS
FORMULA
Empirical: a(n) = 8*a(n-2) for n>3
EXAMPLE
Some solutions for n=3
..7....3....4....5....2....7....6....2....6....3....5....6....7....7....1....1
..4....4....1....4....5....4....7....5....3....6....8....7....4....8....4....2
..7....3....0....3....2....1....4....4....0....7....5....6....3....7....1....1
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: A258438 A038626 A195970 * A180334 A223290 A121089
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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 29 10:59 EDT 2024. Contains 371277 sequences. (Running on oeis4.)