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A221186
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..2 nX3 array
1
2, 27, 274, 2648, 23765, 203122, 1686374, 13787513, 111630017, 898826748, 7215684025, 57832318493, 463108937837, 3706758773474, 29661932054299, 237327986894765, 1898757328855273, 15190598160183104, 121526907452205194
OFFSET
1,1
COMMENTS
Column 3 of A221188
LINKS
EXAMPLE
Some solutions for n=3
..0..1..1....0..1..0....0..1..0....0..1..1....0..1..1....0..0..0....0..0..1
..0..0..0....0..1..0....0..0..0....0..0..0....0..1..1....0..1..0....0..1..1
..0..1..0....0..1..0....1..0..0....1..0..0....1..0..1....1..1..1....0..0..1
CROSSREFS
Sequence in context: A302174 A195604 A011543 * A220530 A199021 A091709
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 04 2013
STATUS
approved