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 A207993 Number of n X n 0..2 arrays with new values 0..2 introduced in row major order and no element equal to any horizontal or vertical neighbor (colorings ignoring permutations of colors). 3
 1, 3, 41, 1302, 96831, 16932816, 6978332618, 6787438272198, 15595829208171337, 84713253582265127190, 1088296274542436098185362, 33079232010276428576508643620, 2379573338713223879592059518246838 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Diagonal of A207997. LINKS R. H. Hardin, Table of n, a(n) for n = 1..16 EXAMPLE Some solutions for n=4 ..0..1..0..1....0..1..2..0....0..1..2..0....0..1..2..0....0..1..2..1 ..1..2..1..0....1..0..1..2....2..0..1..2....1..2..0..2....2..0..1..2 ..2..0..2..1....2..1..2..0....1..2..0..1....2..0..1..0....1..2..0..1 ..0..1..0..2....0..2..0..1....2..1..2..0....1..2..0..1....2..0..1..0 MATHEMATICA A207997 = Import["https://oeis.org/A207997/b207997.txt", "Table"][[All, 2]]; a[n_] := A207997[[2 n^2 - 2 n + 1]]; Table[a[n], {n, 1, 16}] (* Jean-François Alcover, Sep 23 2019 *) CROSSREFS Sequence in context: A012129 A012035 A012016 * A187540 A012104 A012147 Adjacent sequences: A207990 A207991 A207992 * A207994 A207995 A207996 KEYWORD nonn AUTHOR R. H. Hardin, Feb 22 2012 STATUS approved

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Last modified June 4 00:30 EDT 2023. Contains 363118 sequences. (Running on oeis4.)