A189774 Number of n X 4 binary arrays without the pattern 1 0 0 1 diagonally, vertically or horizontally.

15, 225, 3375, 37976, 418550, 4461435, 48633913, 530389481, 5817065520, 63680392402, 697353409375, 7631111846379, 83521134087527, 914046929969572, 10004056595349672, 109490279695417318, 1198342710234669673

Offset

1,1

Comments

Column 4 of A189779.

Links

R. H. Hardin, Table of n, a(n) for n = 1..200

Example

Some solutions for 5 X 4
..0..0..0..0....0..0..0..0....0..0..0..1....0..0..0..1....0..0..1..0
..0..1..0..1....1..1..1..1....0..0..0..1....1..1..0..0....1..0..1..0
..0..0..0..1....0..1..0..1....0..0..0..1....0..1..1..0....1..0..1..0
..1..1..0..0....0..0..1..1....0..1..0..1....1..1..1..0....0..0..1..0
..0..1..0..1....0..1..1..1....0..1..0..0....1..0..0..0....0..1..0..1

Crossrefs

Cf. A189779.

Sequence in context: A189906 A189900 A189338 * A189156 A267731 A001024

Adjacent sequences: A189771 A189772 A189773 * A189775 A189776 A189777

Keyword

nonn

Author

R. H. Hardin Apr 27 2011

Status

approved