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A198597
Number of 2nX2n 0..3 arrays with values 0..3 introduced in row major order and each element equal to exactly two horizontal and vertical neighbors
0
1, 5, 674, 844228, 8055413256
(list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Diagonal of A198604
LINKS
Table of n, a(n) for n=1..5.
EXAMPLE
Some solutions for n=3
..0..0..1..1..1..1....0..0..1..1..2..2....0..0..0..0..1..1....0..0..0..0..1..1
..0..0..1..2..2..1....0..0..1..1..2..2....0..2..2..0..1..1....0..2..2..0..1..1
..2..2..1..2..2..1....1..1..2..2..0..0....0..2..2..0..3..3....0..2..2..0..2..2
..2..2..1..0..0..1....1..1..2..2..0..0....0..3..3..0..3..3....0..0..0..0..2..2
..3..3..1..0..0..1....0..0..3..3..2..2....0..3..3..0..1..1....3..3..2..2..3..3
..3..3..1..1..1..1....0..0..3..3..2..2....0..0..0..0..1..1....3..3..2..2..3..3
CROSSREFS
Sequence in context: A332165 A133750 A203925 * A180315 A332300 A242193
Adjacent sequences: A198594 A198595 A198596 * A198598 A198599 A198600
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 27 2011
STATUS
approved

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Last modified November 6 00:10 EST 2024. Contains 377477 sequences.
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