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.

28, 20444, 3753846, 566131860, 77217209188, 9962925424456, 1239330073038612, 150266249084966072, 17876201804035798190, 2095643146354862834384, 242825031550728210501298

Offset

1,1

Comments

Column 6 of A280284.

Links

Table of n, a(n) for n=1..11.

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

Adjacent sequences: A280280 A280281 A280282 * A280284 A280285 A280286

Keyword

nonn

Author

R. H. Hardin, Dec 30 2016

Status

approved