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A209512 Number of (n+1) X (n+1) 0..2 arrays with the number of clockwise edge increases in every 2 X 2 subblock equal to the number of counterclockwise edge increases. 1
57, 4995, 2071311, 4099186545, 38883961392081, 1772313933013227273, 388756746462464273412765, 410796134340987241848792211659, 2092643007412378548345728130194640495 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Diagonal of A209517.
LINKS
EXAMPLE
Some solutions for n=4:
..1..2..0..0..1....2..1..0..2..2....1..0..0..0..0....0..1..2..2..0
..0..1..2..2..0....0..2..1..0..0....1..0..1..0..0....0..0..1..1..2
..0..1..1..1..2....1..0..2..1..0....2..1..0..2..2....2..0..1..0..1
..1..1..2..1..1....2..1..0..2..1....2..1..1..0..2....0..2..0..1..2
..1..2..2..2..1....2..1..1..0..2....2..1..1..0..2....0..0..2..0..1
CROSSREFS
Sequence in context: A218240 A281567 A012165 * A132783 A221445 A218353
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 09 2012
STATUS
approved

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Last modified July 18 15:51 EDT 2024. Contains 374388 sequences. (Running on oeis4.)