A207980 - OEIS

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A207980

Number of n X 4 nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to any diagonal or antidiagonal neighbor (colorings ignoring permutations of colors).

15, 1080, 587208, 953124784, 3410310590912, 22727131144960768, 253335104721267417984, 4382417290595586402531584, 111319355727036703898865465344, 3978834602846298450265688566196224, 193442461762324413798952526604793292800

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

LINKS

Andrew Howroyd, Table of n, a(n) for n = 1..140

EXAMPLE

Some solutions for n=4

..0..0..0..0....0..1..0..0....0..0..0..0....0..0..1..0....0..0..0..0

..1..1..2..1....2..1..2..1....1..1..2..1....1..2..1..0....1..1..1..1

..0..3..0..0....0..0..0..0....2..0..0..0....0..0..1..0....2..0..0..0

..4..1..1..1....1..1..1..1....1..1..1..2....2..2..1..0....1..1..1..1

CROSSREFS

Column 4 of A207981.

Sequence in context: A233509 A206162 A203409 * A131313 A208346 A236329

Adjacent sequences: A207977 A207978 A207979 * A207981 A207982 A207983

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 22 2012

EXTENSIONS

Terms a(8) and beyond from Andrew Howroyd, Mar 15 2023

STATUS

approved