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A207867 Number of n X 5 nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to any horizontal or vertical neighbor (colorings ignoring permutations of colors). 2
15, 10900, 68162042, 1625686993918, 103204230192540988, 14231913620170652461908, 3737733535781386231895815398, 1704434626479905430949721771156450, 1259921002642906004433313180012192804586, 1431587436371216664854796169984729275373681588 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
Andrew Howroyd, Table of n, a(n) for n = 1..100
EXAMPLE
Some solutions for n=5
..0..1..0..1..0....0..1..0..1..0....0..1..0..1..0....0..1..0..1..0
..1..0..1..0..1....1..0..1..0..1....2..0..1..0..1....1..0..1..0..1
..0..1..0..1..0....0..1..0..1..0....0..1..0..1..0....0..1..0..1..0
..1..0..1..0..1....2..0..1..0..1....1..0..1..2..1....1..2..1..0..1
..0..1..0..1..0....0..1..0..1..0....0..1..0..1..0....0..1..0..1..0
CROSSREFS
Column 5 of A207868.
Sequence in context: A140285 A208401 A198911 * A206513 A271404 A271405
Adjacent sequences: A207864 A207865 A207866 * A207868 A207869 A207870
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 21 2012
EXTENSIONS
Terms a(6) and beyond from Andrew Howroyd, Mar 11 2023
STATUS
approved

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Last modified August 31 17:11 EDT 2024. Contains 375572 sequences. (Running on oeis4.)