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A269282
Number of 7Xn 0..3 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling three exactly once.
1
0, 27634932, 23230366488, 16128206816904, 10181956012212600, 6090616046325570480, 3516906597130333936872, 1980763969657041721006344, 1095070756128723603201412440, 596778595867621855341816843744
OFFSET
1,2
COMMENTS
Row 7 of A269276.
LINKS
EXAMPLE
Some solutions for n=2
..0..0. .0..0. .0..0. .0..0. .0..0. .0..0. .0..0. .0..0. .0..0. .0..0
..0..0. .0..0. .0..0. .0..0. .0..0. .0..0. .0..0. .0..0. .0..0. .0..0
..0..1. .0..3. .0..1. .2..0. .0..2. .0..2. .2..1. .0..1. .2..2. .2..0
..3..3. .1..0. .1..0. .3..2. .3..1. .3..0. .1..1. .3..1. .2..3. .1..0
..0..1. .1..1. .1..0. .0..0. .0..1. .1..1. .1..0. .3..0. .2..3. .3..2
..1..0. .3..1. .2..1. .0..1. .2..0. .1..0. .1..3. .2..2. .3..0. .2..0
..1..3. .1..0. .3..1. .0..0. .0..1. .2..3. .1..3. .3..2. .2..2. .1..3
CROSSREFS
Cf. A269276.
Sequence in context: A202571 A274367 A258688 * A018187 A275612 A275613
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 21 2016
STATUS
approved