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A220374
Equals two maps: number of nX4 binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal and vertical neighbors in a random 0..2 nX4 array.
0
4, 94, 2095, 39780, 722126, 12480964, 209958887, 3466406061
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OFFSET
1,1
COMMENTS
Column 4 of
A220375
LINKS
Table of n, a(n) for n=1..8.
EXAMPLE
Some solutions for n=3
..0..1..1..1....0..0..1..1....0..0..0..0....1..0..0..1....0..0..0..0
..0..1..0..1....1..1..1..0....1..0..1..0....0..0..0..1....1..1..1..1
..0..0..1..1....0..0..0..0....1..0..1..1....1..0..1..0....0..1..1..0
CROSSREFS
Sequence in context:
A116291
A061992
A221389
*
A220429
A210857
A387895
Adjacent sequences:
A220371
A220372
A220373
*
A220375
A220376
A220377
KEYWORD
nonn
AUTHOR
R. H. Hardin
, Dec 13 2012
STATUS
approved
