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A223394 4X4 square grid graph coloring a rectangular array: number of n X n 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
16, 328, 39480, 26836512, 102163935000, 2167784359988816, 255768507759156858992, 167580379521857073501154504, 609297766107012047545889012846856 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A223402

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..10

EXAMPLE

Some solutions for n=3

..2..6..7....7..6.10....2..3..7....5..6..2....7.11.15...11.10.14...11..7..6

..6.10..6...11.10.11....6..7.11....6..5..6...11.10.11...10..9.10....7..3..7

.10..6.10...15.11.10....5..6..7....5..9..5...10.11.10....6.10.11....3..7..6

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: A229456 A246876 A176128 * A218476 A240344 A068368

Adjacent sequences:  A223391 A223392 A223393 * A223395 A223396 A223397

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 19 2013

STATUS

approved

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Last modified January 18 04:26 EST 2022. Contains 350410 sequences. (Running on oeis4.)