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 A198907 Number of n X n 0..7 arrays with values 0..7 introduced in row major order and no element equal to any horizontal or vertical neighbor 2
 1, 4, 2051, 319608038, 4717456775959530, 2869765342757082981876352 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Diagonal of A198914 LINKS Jean-François Alcover, Table of n, a(n) for n = 1..12 EXAMPLE Some solutions with values 0 to 7 for n=3 ..0..1..2....0..1..2....0..1..2....0..1..2....0..1..2....0..1..2....0..1..2 ..3..4..5....3..4..5....3..4..5....3..4..1....3..4..5....3..4..5....3..4..5 ..6..7..4....1..6..7....4..6..7....5..6..7....2..6..7....6..0..7....6..2..7 MATHEMATICA A198914 = Cases[Import["https://oeis.org/A198914/b198914.txt", "Table"], {_, _}][[All, 2]]; a[n_] := A198914[[2 n^2 - 2 n + 1]]; Table[a[n], {n, 1, 12}] (* Jean-François Alcover, Sep 23 2019 *) CROSSREFS Sequence in context: A024060 A198716 A004815 * A207863 A220941 A012869 Adjacent sequences: A198904 A198905 A198906 * A198908 A198909 A198910 KEYWORD nonn AUTHOR R. H. Hardin Oct 31 2011 STATUS approved

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Last modified November 29 16:32 EST 2022. Contains 358431 sequences. (Running on oeis4.)