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A281126 Number of nX4 0..2 arrays with no element equal to more than one of its horizontal, vertical and antidiagonal neighbors, with the exception of exactly one element, and with new values introduced in order 0 sequentially upwards. 1
2, 208, 5590, 75668, 923678, 10441416, 112649322, 1178277478, 12052427112, 121217893114, 1203135774464, 11815341234706, 115023383706648, 1111618427587466, 10676654271394364, 102000704609797814 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A281129.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

EXAMPLE

Some solutions for n=4

..0..0..0..1. .0..1..1..2. .0..0..1..1. .0..1..2..1. .0..0..1..1

..1..1..2..2. .2..0..2..1. .1..2..0..2. .2..1..2..2. .1..2..0..0

..0..0..1..0. .0..1..2..0. .1..0..1..2. .0..2..0..0. .2..1..2..1

..2..2..1..0. .2..0..1..1. .0..2..0..1. .0..1..2..2. .2..0..1..0

CROSSREFS

Cf. A281129.

Sequence in context: A216608 A238819 A110899 * A220940 A012600 A157479

Adjacent sequences:  A281123 A281124 A281125 * A281127 A281128 A281129

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 15 2017

STATUS

approved

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Last modified October 25 19:43 EDT 2021. Contains 348255 sequences. (Running on oeis4.)