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A280905
Number of 4Xn 0..2 arrays with no element equal to more than one of its horizontal and antidiagonal neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.
1
0, 124, 22632, 1451655, 65348136, 2571528867, 91647699996, 3072729111454, 98499096530389, 3053023277146528, 92172928166402753, 2724604438231223343, 79153860087200853877, 2266446081673358266508, 64102854500808145878543
OFFSET
1,2
COMMENTS
Row 4 of A280902.
LINKS
EXAMPLE
Some solutions for n=3
..0..1..1. .0..1..2. .0..1..0. .0..1..0. .0..1..2. .0..1..1. .0..0..1
..1..2..2. .2..2..2. .2..2..0. .0..0..2. .1..0..0. .0..1..2. .0..2..1
..0..0..2. .0..1..1. .0..0..2. .0..0..2. .1..1..1. .0..0..0. .0..2..2
..0..1..0. .1..2..2. .2..2..0. .1..0..2. .2..1..0. .2..2..0. .1..1..1
CROSSREFS
Cf. A280902.
Sequence in context: A097842 A206189 A299828 * A146516 A146546 A146553
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 10 2017
STATUS
approved