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A223417 3-level binary fanout graph coloring a rectangular array: number of nX1 0..6 arrays where 0..6 label nodes of a graph with edges 0,1 1,3 1,4 0,2 2,5 2,6 and every array movement to a horizontal or vertical neighbor moves along an edge of this graph 1
7, 12, 26, 48, 104, 192, 416, 768, 1664, 3072, 6656, 12288, 26624, 49152, 106496, 196608, 425984, 786432, 1703936, 3145728, 6815744, 12582912, 27262976, 50331648, 109051904, 201326592, 436207616, 805306368, 1744830464, 3221225472 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A223423

LINKS

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

FORMULA

Empirical: a(n) = 4*a(n-2) for n>3

EXAMPLE

Some solutions for n=3

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

..2....2....2....1....1....1....1....1....2....1....3....0....2....4....5....1

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

CROSSREFS

Sequence in context: A273307 A093025 A104584 * A224699 A078575 A220036

Adjacent sequences:  A223414 A223415 A223416 * A223418 A223419 A223420

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 20 2013

STATUS

approved

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Last modified October 16 16:20 EDT 2021. Contains 348042 sequences. (Running on oeis4.)