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A269269
Number of n X n 0..3 arrays with some element plus some horizontally or antidiagonally adjacent neighbor totalling three exactly once.
1
0, 108, 46872, 74853576, 542973139128, 19356924219624936, 3516906597130333936872, 3322606082327701612506093240, 16524782213263820847479975782463640
OFFSET
1,2
COMMENTS
Diagonal of A269276.
LINKS
EXAMPLE
Some solutions for n=3
..2..3..1. .0..2..3. .1..3..3. .2..0..0. .3..1..2. .3..3..1. .2..3..0
..3..1..1. .3..3..3. .0..1..1. .2..2..1. .0..2..2. .2..3..2. .1..0..0
..2..0..0. .2..0..1. .0..0..1. .3..1..0. .3..3..1. .1..1..0. .1..1..0
CROSSREFS
Cf. A269276.
Sequence in context: A216592 A202634 A270255 * A230474 A030248 A033535
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 21 2016
STATUS
approved