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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 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 4 of A220375
LINKS
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 A220682
KEYWORD
nonn
AUTHOR
R. H. Hardin Dec 13 2012
STATUS
approved

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Last modified June 13 15:51 EDT 2024. Contains 373389 sequences. (Running on oeis4.)