A220539 Equals one maps: number of 3Xn binary arrays indicating the locations of corresponding elements equal to exactly one of their horizontal, diagonal and antidiagonal neighbors in a random 0..1 3Xn array

1, 31, 55, 625, 2555, 17935, 90171, 544856, 2962859, 17081286, 94990161, 539185536, 3022799372, 17066737846, 95943415702, 540694505626, 3042529902216, 17135308344664

Offset

1,2

Comments

Row 3 of A220537

Links

Table of n, a(n) for n=1..18.

Example

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

Crossrefs

Sequence in context: A104332 A045116 A092227 * A193362 A293345 A096453

Adjacent sequences: A220536 A220537 A220538 * A220540 A220541 A220542

Keyword

nonn

Author

R. H. Hardin Dec 15 2012

Status

approved