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 A233250 Number of n X n 0..5 arrays with no element x(i,j) adjacent to itself or value 5-x(i,j) horizontally or antidiagonally, top left element zero, and 1 appearing before 2 3 and 4, and 2 appearing before 3 in row major order (unlabelled 6-colorings with no clashing color pairs) 1
 1, 10, 4672, 23896064, 1159192379392, 525597937107992576, 2242238966451009797226496, 90075874398562137894702244954112, 34144912055691090021767126315871433129984 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Diagonal of A233256 LINKS R. H. Hardin, Table of n, a(n) for n = 1..15 EXAMPLE Some solutions for n=3 ..0..1..2....0..1..2....0..1..2....0..1..5....0..1..0....0..1..0....0..1..0 ..3..5..3....2..5..3....2..0..3....0..1..5....5..1..5....2..1..2....2..1..5 ..3..4..5....3..4..5....1..5..3....5..2..5....2..4..3....3..0..3....5..2..5 CROSSREFS Sequence in context: A294747 A199354 A276241 * A273415 A223055 A308488 Adjacent sequences:  A233247 A233248 A233249 * A233251 A233252 A233253 KEYWORD nonn AUTHOR R. H. Hardin, Dec 06 2013 STATUS approved

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Last modified June 1 18:43 EDT 2020. Contains 334762 sequences. (Running on oeis4.)