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 A209952 Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock having one, three or four distinct clockwise edge differences 1
 71, 12161, 14922177, 131724081683, 8356768819356343, 3811099763671947037073, 12493316536665519357482808705, 294391907024716464395174365141711571, 49864726192803453135807335081496483729871063 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A209960 LINKS R. H. Hardin, Table of n, a(n) for n = 1..12 EXAMPLE Some solutions for n=4 ..2..1..2..1..0....0..2..1..2..2....0..0..1..1..0....2..1..0..2..2 ..1..1..1..1..1....2..2..1..1..1....0..1..1..2..2....0..0..2..1..0 ..1..1..1..0..2....1..0..0..0..0....2..0..1..2..0....1..2..1..1..0 ..2..1..2..2..2....1..1..1..0..2....1..1..1..1..0....2..2..2..0..2 ..2..1..2..1..1....1..2..1..1..1....1..1..2..2..2....2..0..1..2..1 CROSSREFS Sequence in context: A200960 A260034 A250974 * A251382 A208679 A220980 Adjacent sequences: A209949 A209950 A209951 * A209953 A209954 A209955 KEYWORD nonn AUTHOR R. H. Hardin Mar 16 2012 STATUS approved

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Last modified September 21 02:47 EDT 2023. Contains 365486 sequences. (Running on oeis4.)