A223378 3X3 square grid graph coloring a rectangular array: number of nX7 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

4352, 1502736, 598980512, 242067684912, 98124582178928, 39794518790036624, 16140699524652927296, 6546839621183266518272, 2655488111339124689289728, 1077103711078803025921975888, 436888972160952271231852850736

Offset

1,1

Comments

Column 7 of A223379

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

Some solutions for n=3
..0..1..0..3..4..1..4....0..1..0..1..0..1..2....0..1..0..1..2..1..0
..1..0..3..4..3..4..3....1..0..1..2..1..4..1....1..0..1..4..1..4..1
..0..1..0..3..4..5..4....0..1..0..1..0..1..0....0..1..0..1..4..1..2
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: A252302 A235066 A170786 * A239193 A068292 A185796

Adjacent sequences: A223375 A223376 A223377 * A223379 A223380 A223381

Keyword

nonn

Author

R. H. Hardin Mar 19 2013

Status

approved