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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).
2
1, 52, 21147, 113503692, 2475181138384, 148049849095504726, 19558496206477343793824, 4971673449365938875551493054, 2209363673053161750976745846408452, 1599235210372714053663919266990430641290, 1785670329039896818784300269276903576597674264
OFFSET
0,2
LINKS
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
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