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 A208093 Number of nX3 nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to any horizontal, diagonal or antidiagonal neighbor (colorings ignoring permutations of colors) 2
 2, 30, 1573, 192328, 43366459, 15769674462, 8494585220016, 6391850672195207, 6435536606760976374, 8388789053759733374255, 13792349692923790472807338, 28002764873470436036725295426, 68986219453948522377865096287773 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 3 of A208096 LINKS R. H. Hardin, Table of n, a(n) for n = 1..16 EXAMPLE Some solutions for n=4 ..0..1..2....0..1..0....0..1..0....0..1..2....0..1..0....0..1..0....0..1..0 ..0..1..2....2..1..0....0..1..0....0..3..0....0..1..0....2..3..0....0..1..0 ..0..1..0....3..1..2....0..1..0....0..1..0....2..1..2....0..3..0....0..1..2 ..0..1..0....2..1..0....0..2..3....0..3..0....0..1..0....0..1..0....0..1..0 CROSSREFS Sequence in context: A364504 A262004 A132104 * A144501 A198861 A162841 Adjacent sequences: A208090 A208091 A208092 * A208094 A208095 A208096 KEYWORD nonn AUTHOR R. H. Hardin Feb 23 2012 STATUS approved

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Last modified June 13 23:50 EDT 2024. Contains 373391 sequences. (Running on oeis4.)