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A208300
Number of n X 6 nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to any horizontal or antidiagonal neighbor (colorings ignoring permutations of colors).
2
1, 52, 373780, 33093356640, 14216420563705724, 19558496206477343793824, 67939294184937980415465539016, 510275358863420934339418249390485008, 7427072102775408021555037479377677353344288, 193059270325130351714478780835691676245238854091968
OFFSET
0,2
LINKS
EXAMPLE
Some solutions for n=4:
..0..1..0..1..0..1....0..1..0..1..2..1....0..1..0..1..0..1....0..1..0..1..2..1
..0..1..0..1..0..1....0..1..0..1..0..1....0..1..0..1..0..1....0..1..0..3..0..1
..2..1..3..1..0..1....2..1..2..1..0..1....0..1..0..1..0..1....0..1..0..2..3..0
..0..1..0..1..2..0....2..0..2..3..0..1....0..1..0..1..0..1....0..1..0..1..2..0
CROSSREFS
Column 6 of A208301.
Sequence in context: A198980 A198721 A198912 * A038778 A116107 A114787
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 25 2012
EXTENSIONS
a(0)=1 prepended and terms a(6) and beyond from Andrew Howroyd, May 18 2020
STATUS
approved