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A198446
Number of 2nX2n 0..2 arrays with values 0..2 introduced in row major order and each element unequal to exactly two horizontal and vertical neighbors
0
3, 177, 26704, 13048509, 22496409154
(list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Diagonal of A198452
LINKS
Table of n, a(n) for n=1..5.
EXAMPLE
Some solutions for n=3
..0..1..2..1..0..1....0..1..1..0..1..2....0..1..1..2..1..2....0..1..1..2..2..1
..1..1..2..1..0..2....2..0..0..0..1..0....2..0..0..2..1..0....1..2..2..0..0..2
..0..0..2..1..0..2....2..0..1..1..1..0....2..0..0..2..1..0....1..2..2..0..0..2
..1..0..2..1..0..0....0..0..1..0..0..2....0..1..1..2..1..1....0..0..0..2..2..1
..1..0..2..1..1..1....2..2..1..0..0..2....0..1..1..2..2..2....2..2..0..2..2..1
..2..0..2..0..0..2....0..2..1..2..2..0....1..0..0..1..1..0....1..2..0..1..1..2
CROSSREFS
Sequence in context: A268949 A113270 A091324 * A216967 A217443 A270245
Adjacent sequences: A198443 A198444 A198445 * A198447 A198448 A198449
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 25 2011
STATUS
approved

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Last modified October 5 04:48 EDT 2024. Contains 376530 sequences.
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