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 A206669 Number of (n+1) X (n+1) 0..2 arrays with no 2 X 2 subblock having the same number of clockwise edge increases as its horizontal neighbors or the same number of counterclockwise edge increases as its vertical neighbors. 0
 81, 1812, 57258, 2046168, 117968049, 9838056114, 1530071121621 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A206676. LINKS Table of n, a(n) for n=1..7. EXAMPLE Some solutions for n=4: ..0..0..0..1..1....2..2..0..1..2....2..0..2..1..0....1..2..1..2..2 ..0..0..1..0..0....0..2..1..1..0....2..1..1..0..0....1..0..1..0..2 ..2..2..0..0..0....1..0..1..1..2....0..1..1..0..0....1..2..2..2..0 ..0..1..1..2..1....0..0..2..0..0....0..2..2..1..0....1..2..2..1..0 ..0..1..1..0..0....0..0..1..1..2....1..2..2..2..1....0..1..1..2..0 CROSSREFS Sequence in context: A236057 A205910 A236811 * A223206 A296650 A233371 Adjacent sequences: A206666 A206667 A206668 * A206670 A206671 A206672 KEYWORD nonn AUTHOR R. H. Hardin, Feb 11 2012 STATUS approved

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Last modified July 19 10:10 EDT 2024. Contains 374392 sequences. (Running on oeis4.)