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 A207978 Number of n X 2 nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to any diagonal or antidiagonal neighbor (colorings ignoring permutations of colors). 1
 2, 7, 67, 1080, 25287, 794545, 31858034, 1573857867, 93345011951, 6514819011216, 526593974392123, 48658721593531669, 5084549201524804642, 595348294459678745663, 77500341343460209843627 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 2 of A207981. LINKS R. H. Hardin, Table of n, a(n) for n = 1..40 EXAMPLE Some solutions for n=4 ..0..0....0..0....0..0....0..0....0..0....0..0....0..1....0..0....0..0....0..1 ..1..1....1..1....1..1....1..1....1..1....1..1....0..1....1..1....1..1....2..1 ..2..3....2..0....2..0....2..2....0..2....0..0....0..1....0..2....0..2....0..1 ..2..0....3..3....1..0....3..4....3..1....1..1....0..1....3..4....0..1....0..1 CROSSREFS Cf. A207981. Sequence in context: A133237 A099660 A341088 * A307246 A225156 A260968 Adjacent sequences:  A207975 A207976 A207977 * A207979 A207980 A207981 KEYWORD nonn AUTHOR R. H. Hardin, Feb 22 2012 STATUS approved

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Last modified July 2 18:27 EDT 2022. Contains 355029 sequences. (Running on oeis4.)