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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.)