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 A199224 Number of nX2 0..2 arrays with values 0..2 introduced in row major order, the number of instances of each value within one of each other, and every element equal to zero or one horizontal or vertical neighbors 1
 1, 6, 15, 148, 739, 1538, 19458, 99290, 199245, 2737170, 14308328, 28263858, 406132996, 2157586976, 4223483322, 62496247170, 335699045124, 653268735784, 9869313704764, 53437060321924, 103559574448252, 1588892060781914 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Column 2 of A199230 LINKS R. H. Hardin, Table of n, a(n) for n = 1..153 EXAMPLE Some solutions for n=4 ..0..1....0..1....0..0....0..1....0..1....0..0....0..1....0..1....0..1....0..1 ..1..2....0..1....1..2....0..1....2..0....1..1....2..0....0..2....2..0....2..2 ..2..0....2..2....0..1....1..2....2..1....2..0....0..1....1..0....1..2....0..1 ..1..0....1..0....2..2....0..2....0..1....2..1....2..1....1..2....0..2....2..1 CROSSREFS Sequence in context: A013227 A013223 A219289 * A013224 A013230 A306342 Adjacent sequences: A199221 A199222 A199223 * A199225 A199226 A199227 KEYWORD nonn AUTHOR R. H. Hardin Nov 04 2011 STATUS approved

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Last modified October 1 22:38 EDT 2023. Contains 365828 sequences. (Running on oeis4.)