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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). 1
 1, 52, 21147, 113503692, 2475181138384, 148049849095504726, 19558496206477343793824, 4971673449365938875551493054, 2209363673053161750976745846408452, 1599235210372714053663919266990430641290, 1785670329039896818784300269276903576597674264 (list; graph; refs; listen; history; text; internal format)
 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: A208100 A232521 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

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Last modified July 25 13:05 EDT 2021. Contains 346290 sequences. (Running on oeis4.)