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A223401 4X4 square grid graph coloring a rectangular array: number of nX7 0..15 arrays where 0..15 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
16488, 6985008, 3445747472, 1770698081072, 924127826390176, 485449397967176280, 255768507759156858992, 134949783828939584120672, 71254070803235893596880736, 37636402829217559686241021952 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A223402

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..109

EXAMPLE

Some solutions for n=3

..4..0..1..5..1..0..4....4..0..1..5..1..5..9....4..0..1..5..6.10..6

..0..1..2..1..5..4..5....0..1..2..1..0..1..5....0..1..2..6..5..9..5

..4..0..1..5..4..8..4....4..0..1..2..1..0..4....4..0..1..5..9..5..9

Vertex neighbors:

0 -> 1 4

1 -> 0 2 5

2 -> 1 3 6

3 -> 2 7

4 -> 0 5 8

5 -> 4 1 6 9

6 -> 5 2 7 10

7 -> 6 3 11

8 -> 4 9 12

9 -> 8 5 10 13

10 -> 9 6 11 14

11 -> 10 7 15

12 -> 8 13

13 -> 12 9 14

14 -> 13 10 15

15 -> 14 11

CROSSREFS

Sequence in context: A234054 A234055 A234047 * A281480 A170779 A251903

Adjacent sequences:  A223398 A223399 A223400 * A223402 A223403 A223404

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 19 2013

STATUS

approved

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Last modified October 23 16:40 EDT 2020. Contains 337969 sequences. (Running on oeis4.)