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A220531
Equals two maps: number of nX4 binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal, vertical and antidiagonal neighbors in a random 0..3 nX4 array.
0
4, 107, 2660, 53150, 947486, 15864668, 258344332, 4160105184
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OFFSET
1,1
COMMENTS
Column 4 of
A220532
LINKS
Table of n, a(n) for n=1..8.
EXAMPLE
Some solutions for n=3
..1..1..1..0....0..0..0..1....0..0..1..0....0..1..0..0....1..1..1..0
..0..0..0..1....0..0..1..1....1..1..1..0....1..0..0..0....0..0..0..0
..1..0..1..1....1..0..0..0....1..0..1..0....0..1..1..1....0..1..0..1
CROSSREFS
Sequence in context:
A356201
A222930
A221187
*
A322085
A128865
A269270
Adjacent sequences:
A220528
A220529
A220530
*
A220532
A220533
A220534
KEYWORD
nonn
AUTHOR
R. H. Hardin
, Dec 15 2012
STATUS
approved
