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A269220
Number of 7Xn 0..3 arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling three exactly once.
1
0, 7375872, 2039727744, 599456856000, 163535201141376, 43468685827935816, 11273191243423937904, 2872961996154823592256, 722010748558146090563664, 179436639887553691981747008, 44187481124719769649267286128
OFFSET
1,2
COMMENTS
Row 7 of A269214.
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..2. .0..0. .0..0. .0..0. .0..0. .0..2. .0..0. .0..0. .0..2. .0..0
..2..0. .0..1. .1..0. .1..0. .0..0. .0..2. .1..1. .1..1. .0..0. .1..3
..2..3. .3..3. .1..1. .2..3. .2..2. .2..2. .2..3. .0..1. .0..0. .3..1
..1..1. .2..2. .1..3. .0..2. .3..3. .3..2. .2..2. .3..2. .1..3. .3..1
..3..1. .2..3. .3..2. .3..2. .2..1. .0..3. .2..0. .1..3. .1..1. .3..2
..3..2. .3..3. .3..2. .3..3. .0..0. .2..2. .1..3. .1..3. .0..0. .0..1
CROSSREFS
Cf. A269214.
Sequence in context: A116259 A158256 A306873 * A268406 A302135 A104921
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 20 2016
STATUS
approved