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 A186164 1/4 the number of nX5 0..3 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors 1
 7, 2175, 253341, 37402872, 5033988714, 704281652979, 96951738076992, 13435825601048421, 1856827788245959473, 256908205340960558187, 35528479510856892673200, 4914300705034627821533085 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 5 of A186168 LINKS R. H. Hardin, Table of n, a(n) for n = 1..21 EXAMPLE Some solutions for 4X5 with a(1,1)=0 ..0..0..0..1..1....0..0..0..0..0....0..0..0..3..3....0..0..0..2..2 ..0..2..0..1..2....0..2..1..1..1....0..2..0..1..3....0..2..0..2..1 ..1..2..2..1..2....0..2..2..3..3....0..2..2..1..1....0..2..0..3..1 ..1..1..0..0..2....3..3..3..0..0....0..3..3..0..0....0..2..0..3..3 CROSSREFS Sequence in context: A004818 A125538 A129732 * A203686 A248142 A216472 Adjacent sequences: A186161 A186162 A186163 * A186165 A186166 A186167 KEYWORD nonn AUTHOR R. H. Hardin Feb 13 2011 STATUS approved

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Last modified May 28 06:10 EDT 2023. Contains 362992 sequences. (Running on oeis4.)