A220457 Equals one maps: number of n X 3 binary arrays indicating the locations of corresponding elements equal to exactly one of their horizontal, vertical and antidiagonal neighbors in a random 0..1 n X 3 array.

4, 22, 108, 691, 3872, 20897, 112582, 605780, 3249132, 17400206, 93125105, 498148634, 2663790130, 14241169579, 76125716517, 406890173406, 2174685548474, 11622471918192, 62113961444133, 331949857443568, 1773988622548460

Offset

1,1

Comments

Column 3 of A220461.

Links

R. H. Hardin, Table of n, a(n) for n = 1..115

Example

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

Crossrefs

Cf. A220461.

Sequence in context: A001436 A224243 A024420 * A108840 A007994 A006651

Adjacent sequences: A220454 A220455 A220456 * A220458 A220459 A220460

Keyword

nonn

Author

R. H. Hardin, Dec 15 2012

Status

approved