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).

1, 52, 373780, 33093356640, 14216420563705724, 19558496206477343793824, 67939294184937980415465539016, 510275358863420934339418249390485008, 7427072102775408021555037479377677353344288, 193059270325130351714478780835691676245238854091968

Offset

0,2

Links

Andrew Howroyd, Table of n, a(n) for n = 0..50

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

Adjacent sequences: A208297 A208298 A208299 * A208301 A208302 A208303

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