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A220276
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..1 nX3 array
0
2, 25, 148, 1142, 7987, 55034, 383153, 2657666, 18466741, 128094083, 888814278, 6166025688, 42777035035, 296733282297, 2058350850742, 14277750934523, 99037048938338, 686957234158089, 4764973628818287
OFFSET
1,1
COMMENTS
Column 3 of A220279
EXAMPLE
Some solutions for n=3
..0..0..0....0..1..0....1..1..1....0..1..1....0..1..1....1..1..0....0..0..0
..1..0..0....0..1..1....0..0..0....0..1..1....1..1..0....1..1..0....0..0..1
..1..0..1....1..0..0....0..1..0....0..0..0....1..1..1....0..0..0....1..0..0
CROSSREFS
Sequence in context: A009381 A063264 A024533 * A361874 A215298 A094218
KEYWORD
nonn
AUTHOR
R. H. Hardin Dec 09 2012
STATUS
approved