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A220429 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..3 nX4 array 0
4, 94, 2103, 40412, 735555, 12702453, 213282872, 3513823635 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 4 of A220430
LINKS
EXAMPLE
Some solutions for n=3
..1..1..0..1....0..1..0..1....1..0..1..1....1..1..0..1....0..1..1..1
..1..0..0..1....0..1..1..1....1..0..1..1....1..0..0..1....1..1..0..0
..0..0..1..1....0..1..1..0....1..1..1..0....0..0..0..1....1..0..1..0
CROSSREFS
Sequence in context: A061992 A221389 A220374 * A210857 A220682 A210926
KEYWORD
nonn
AUTHOR
R. H. Hardin Dec 14 2012
STATUS
approved

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Last modified June 24 19:02 EDT 2024. Contains 373689 sequences. (Running on oeis4.)