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A268788
Number of nX7 binary arrays with some element plus some horizontally, vertically or antidiagonally adjacent neighbor totalling two exactly once.
1
38, 850, 14984, 228384, 3295246, 45515227, 611932378, 8057509992, 104456486696, 1337467436839, 16954554895936, 213155407369839, 2661273257222436, 33030289066656341, 407868045265169610, 5014148928763408926
OFFSET
1,1
COMMENTS
Column 7 of A268789.
FORMULA
Empirical recurrence of order 68 (see link above)
EXAMPLE
Some solutions for n=3
..0..0..0..0..0..1..0. .0..1..0..0..1..0..0. .1..1..0..0..0..1..0
..1..0..0..0..0..0..1. .0..0..0..1..0..0..0. .0..0..0..0..0..0..0
..0..0..0..1..0..0..1. .0..1..0..0..0..1..0. .1..0..0..0..0..1..0
CROSSREFS
Cf. A268789.
Sequence in context: A020930 A104761 A270500 * A016075 A028226 A028224
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 13 2016
STATUS
approved