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A280283
Number of nX6 0..2 arrays with no element equal to more than one of its horizontal and vertical neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards.
0
28, 20444, 3753846, 566131860, 77217209188, 9962925424456, 1239330073038612, 150266249084966072, 17876201804035798190, 2095643146354862834384, 242825031550728210501298
OFFSET
1,1
COMMENTS
Column 6 of A280284.
EXAMPLE
Some solutions for n=2
..0..1..0..2..1..1. .0..1..0..0..2..0. .0..1..2..2..0..1. .0..1..1..2..1..0
..0..0..1..0..2..0. .1..2..2..1..2..2. .2..1..2..1..2..2. .1..2..0..0..0..2
CROSSREFS
Cf. A280284.
Sequence in context: A147291 A147304 A221897 * A221928 A281324 A370364
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 30 2016
STATUS
approved