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A206534 Number of (n+1) X (n+1) 0..2 arrays with the number of clockwise edge increases in 2 X 2 subblocks nondecreasing, and counterclockwise edge increases nonincreasing, rightwards and downwards. 0
81, 2577, 141759, 22647363, 9567269487, 10370489275269, 28770371143057311, 203028344528664369537, 3648979640901069855030843 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Diagonal of A206542.
LINKS
EXAMPLE
Some solutions for n=4:
..1..2..1..2..1....0..2..1..2..2....1..2..0..2..1....0..1..0..2..0
..1..1..1..1..1....2..2..1..1..1....0..1..2..0..2....1..2..1..0..1
..2..1..2..1..2....0..2..2..1..0....2..0..1..2..0....0..1..2..1..0
..1..1..1..1..1....0..2..1..1..1....0..1..2..0..2....1..2..0..2..1
..0..0..0..0..0....2..2..1..2..1....2..0..1..2..1....0..1..2..0..2
CROSSREFS
Sequence in context: A237473 A282995 A295274 * A231859 A210128 A297084
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 09 2012
STATUS
approved

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Last modified March 28 16:34 EDT 2024. Contains 371254 sequences. (Running on oeis4.)