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A186166
1/4 the number of n X 7 0..3 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.
0
40, 99933, 87054174, 95752776009, 96951738076992, 101554003879403823
(list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 7 of A186168.
LINKS
Table of n, a(n) for n=1..6.
EXAMPLE
Some solutions for 4 X 7 with a(1,1) = 0
..0..0..2..0..0..0..1....0..0..2..0..0..3..0....0..0..2..0..0..0..0
..0..0..2..0..2..2..1....0..0..2..0..3..3..0....0..0..2..0..2..2..1
..2..2..0..2..3..3..1....2..2..0..2..3..0..1....2..2..0..1..2..1..1
..0..0..0..2..3..2..2....0..0..0..2..0..0..1....0..0..0..1..1..3..3
CROSSREFS
Cf. A186168.
Sequence in context: A323489 A266157 A223103 * A151605 A253107 A300842
Adjacent sequences: A186163 A186164 A186165 * A186167 A186168 A186169
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 13 2011
STATUS
approved

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Last modified September 28 10:43 EDT 2024. Contains 376292 sequences.
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