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A220245 Equals two maps: number of nX4 binary arrays indicating the locations of corresponding elements equal to exactly two of their king-move neighbors in a random 0..1 nX4 array 0
4, 37, 816, 7140, 64258, 660677, 6228324, 59704733, 580593280, 5565851685, 53535536290 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 4 of A220247
LINKS
EXAMPLE
Some solutions for n=3
..0..1..0..0....0..0..1..0....0..1..0..1....0..1..0..1....0..0..1..0
..0..0..1..0....1..1..0..0....0..0..1..0....0..0..0..0....0..0..1..1
..1..0..1..0....0..0..0..0....0..0..1..1....1..0..0..0....0..0..0..0
CROSSREFS
Sequence in context: A084283 A163880 A183509 * A280219 A027461 A144991
KEYWORD
nonn
AUTHOR
R. H. Hardin Dec 08 2012
STATUS
approved

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Last modified March 3 18:55 EST 2024. Contains 370512 sequences. (Running on oeis4.)