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

16488, 6985008, 3445747472, 1770698081072, 924127826390176, 485449397967176280, 255768507759156858992, 134949783828939584120672, 71254070803235893596880736, 37636402829217559686241021952

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