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 A186165 1/4 the number of nX6 0..3 arrays with every element equal to exactly one or two of its horizontal and vertical neighbors 0
 19, 14748, 4762206, 1899336597, 704281652979, 268995986029278, 101554003879403823, 38514280297010210802 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 6 of A186168 LINKS Table of n, a(n) for n=1..8. EXAMPLE Some solutions for 4X6 with a(1,1)=0 ..0..0..0..2..2..2....0..0..0..2..2..0....0..0..0..2..2..0....0..0..0..2..2..0 ..0..2..0..0..0..2....0..2..0..0..2..0....0..2..0..0..0..0....0..2..0..0..3..0 ..3..2..1..2..0..3....3..2..1..1..2..0....0..2..2..2..2..2....1..2..2..3..3..0 ..3..1..1..2..0..3....3..0..0..0..2..0....0..0..0..0..1..1....1..0..0..3..2..2 CROSSREFS Sequence in context: A174306 A270069 A357252 * A198412 A110392 A107100 Adjacent sequences: A186162 A186163 A186164 * A186166 A186167 A186168 KEYWORD nonn AUTHOR R. H. Hardin Feb 13 2011 STATUS approved

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Last modified October 1 09:00 EDT 2023. Contains 365817 sequences. (Running on oeis4.)