

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




OFFSET

1,2


COMMENTS

Diagonal of A198914


LINKS

JeanFrançois 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}] (* JeanFrançois 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



