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A223367 6X6X6 triangular graph coloring a rectangular array: number of nX5 0..20 arrays where 0..20 label nodes of the fully triangulated graph and every array movement to a horizontal or vertical neighbor moves along an edge of this graph 1
9552, 1686042, 356391222, 78876317946, 17823802572918, 4058501783492178, 928457167048336590, 212807842861152381090, 48847537657537109132742, 11218691918610300123247002, 2577890303656450712737152198 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A223370

LINKS

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

EXAMPLE

Some solutions for n=3

..1..0..1..3..6....1..0..2..4..5....1..0..2..4..8....1..0..1..0..2

..0..1..3..1..3....0..2..4..2..4....0..1..4..8..7....0..1..0..1..0

..1..3..6..3..4....2..4..2..4..1....2..4..8.13..8....1..4..2..0..2

Vertex neighbors:

0 -> 1 2

1 -> 0 2 3 4

2 -> 0 1 4 5

3 -> 1 4 6 7

4 -> 1 2 3 5 7 8

5 -> 2 4 8 9

6 -> 3 7 10 11

7 -> 3 4 6 8 11 12

8 -> 4 5 7 9 12 13

9 -> 5 8 13 14

10 -> 6 11 15 16

11 -> 6 7 10 12 16 17

12 -> 7 8 11 13 17 18

13 -> 8 9 12 14 18 19

14 -> 9 13 19 20

15 -> 10 16

16 -> 10 11 15 17

17 -> 11 12 16 18

18 -> 12 13 17 19

19 -> 13 14 18 20

20 -> 14 19

CROSSREFS

Sequence in context: A162029 A251909 A251906 * A136476 A136479 A254015

Adjacent sequences:  A223364 A223365 A223366 * A223368 A223369 A223370

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 19 2013

STATUS

approved

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Last modified November 30 06:28 EST 2021. Contains 349419 sequences. (Running on oeis4.)