A220285 Equals one maps: number of nX4 binary arrays indicating the locations of corresponding elements equal to exactly one of their horizontal and vertical neighbors in a random 0..1 nX4 array.

8, 96, 1411, 15382, 232795, 3061937, 40463019, 533004621

Offset

1,1

Comments

Column 4 of A220287

Links

Table of n, a(n) for n=1..8.

Example

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

Crossrefs

Sequence in context: A098430 A365847 A369538 * A052570 A034177 A002168

Adjacent sequences: A220282 A220283 A220284 * A220286 A220287 A220288

Keyword

nonn

Author

R. H. Hardin, Dec 09 2012

Status

approved