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A220530
Equals two maps: number of nX3 binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal, vertical and antidiagonal neighbors in a random 0..3 nX3 array
0
2, 27, 274, 2660, 23948, 204634, 1697940, 13869434, 112203992, 902932630, 7245817986, 58059100355
OFFSET
1,1
COMMENTS
Column 3 of A220532
EXAMPLE
Some solutions for n=3
..0..1..0....1..0..0....0..1..1....0..0..0....0..0..0....0..1..0....0..1..1
..1..1..0....1..0..0....0..0..0....1..0..1....1..1..0....0..1..1....1..1..0
..1..0..0....1..0..1....1..1..0....1..1..1....0..1..0....0..1..0....1..1..0
CROSSREFS
Sequence in context: A195604 A011543 A221186 * A199021 A091709 A083384
KEYWORD
nonn
AUTHOR
R. H. Hardin Dec 15 2012
STATUS
approved