A220284 Equals one maps: number of nX3 binary arrays indicating the locations of corresponding elements equal to exactly one of their horizontal and vertical neighbors in a random 0..1 nX3 array

4, 31, 139, 1411, 9430, 63154, 452515, 3130768, 21630714, 150540232, 1043064746, 7226190511, 50094800811, 347052655839, 2404198149909, 16655726484462, 115373519626103, 799165840938429, 5535587924914620, 38342402997836989

Offset

1,1

Comments

Column 3 of A220287

Links

R. H. Hardin, Table of n, a(n) for n = 1..21

Example

Some solutions for n=3
..0..0..1....1..0..1....1..1..0....0..0..0....1..0..1....1..0..0....0..1..0
..0..0..1....1..0..1....1..0..1....0..0..0....0..0..0....0..0..1....0..0..0
..1..1..0....0..1..0....1..0..0....0..1..0....0..0..0....0..0..1....0..0..0

Crossrefs

Sequence in context: A263760 A297501 A296734 * A059938 A263761 A263762

Adjacent sequences: A220281 A220282 A220283 * A220285 A220286 A220287

Keyword

nonn

Author

R. H. Hardin Dec 09 2012

Status

approved