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A208097 Number of 2 X n nonnegative integer arrays with new values 0 upwards introduced in row major order and no element equal to any horizontal, diagonal or antidiagonal neighbor (colorings ignoring permutations of colors). 2
2, 4, 30, 377, 7239, 193228, 6752442, 296290708, 15835464207, 1007305486325, 74890158775564, 6413015600048526, 624933541074620780, 68603269124243415049, 8411144435499643711885, 1143251056778815843116186 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Row 2 of A208096.
LINKS
EXAMPLE
Some solutions for n=4:
..0..1..2..1....0..1..0..1....0..1..2..0....0..1..2..0....0..1..2..0
..3..1..4..5....0..1..0..2....0..1..3..1....0..1..2..0....3..1..2..4
CROSSREFS
Sequence in context: A241542 A241540 A349265 * A132473 A053037 A018294
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 23 2012
STATUS
approved

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Last modified June 22 09:48 EDT 2024. Contains 373568 sequences. (Running on oeis4.)