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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
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OFFSET
1,1
COMMENTS
Column 3 of
A220532
LINKS
Table of n, a(n) for n=1..12.
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
Adjacent sequences:
A220527
A220528
A220529
*
A220531
A220532
A220533
KEYWORD
nonn
AUTHOR
R. H. Hardin
, Dec 15 2012
STATUS
approved
