A208305 Number of 5 X n 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, 21147, 113503692, 2475181138384, 148049849095504726, 19558496206477343793824, 4971673449365938875551493054, 2209363673053161750976745846408452, 1599235210372714053663919266990430641290, 1785670329039896818784300269276903576597674264

Offset

0,2

Links

Andrew Howroyd, Table of n, a(n) for n = 0..100

Example

Some solutions for n=4:
..0..1..0..1....0..1..0..1....0..1..2..0....0..1..0..1....0..1..0..1
..0..1..0..1....0..1..0..1....3..0..1..0....0..1..0..1....0..2..0..1
..0..1..2..0....0..1..0..1....4..0..1..0....0..1..0..1....0..1..0..1
..0..1..2..0....0..1..2..0....1..2..1..0....0..2..0..1....0..2..0..1
..0..1..2..3....0..1..2..0....0..2..1..4....0..1..0..1....0..1..2..0

Crossrefs

Row 5 of A208301.

Sequence in context: A232521 A346934 A200806 * A098148 A068255 A230532

Adjacent sequences: A208302 A208303 A208304 * A208306 A208307 A208308

Keyword

nonn

Author

R. H. Hardin, Feb 25 2012

Extensions

a(0)=1 prepended and terms a(7) and beyond from Andrew Howroyd, May 18 2020

Status

approved