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A206269 Number of (n+1) X (n+1) 0..2 arrays with no 2 X 2 subblock having the number of clockwise edge increases equal to the number of counterclockwise edge increases in its adjacent leftward or upward neighbors. 0
81, 972, 12429, 145824, 2243139, 39044748, 964315869, 27362301828, 1106854279383, 53489846569626, 3690406822607805 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Diagonal of A206277.
LINKS
EXAMPLE
Some solutions for n=4:
..2..1..0..2..1....2..0..0..2..1....0..2..2..0..1....1..1..1..0..2
..0..1..1..0..0....2..0..0..0..2....0..1..2..1..0....1..1..2..1..1
..0..1..1..0..0....0..2..0..0..2....1..1..0..2..2....0..2..0..0..1
..1..0..0..1..0....0..0..1..1..0....0..2..1..2..0....2..0..0..0..2
..2..0..0..0..2....0..0..1..1..2....1..0..1..1..0....2..0..0..1..0
CROSSREFS
Sequence in context: A173810 A205047 A086580 * A236885 A205729 A237226
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 05 2012
STATUS
approved

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Last modified July 22 00:58 EDT 2024. Contains 374478 sequences. (Running on oeis4.)