A181223 Number of nX7 binary matrices with no three 1's adjacent in a line horizontally, vertically, diagonally or antidiagonally

81, 6561, 179097, 7426986, 316896477, 12297765846, 493466099722, 19886730240632, 794878208506289, 31852650059853831, 1277093175893680596, 51166967011661264756, 2050407503529684003122, 82170493913101130433607

Offset

1,1

Comments

Column 7 of A181224

Links

R. H. Hardin, Table of n, a(n) for n=1..175

Example

Some avoided solutions for 3X7
..1..0..0..0..0..1..0....0..0..0..0..0..0..0....0..1..0..1..0..0..0
..1..0..0..0..0..0..0....1..1..1..0..0..0..0....0..0..0..0..1..0..0
..1..0..0..0..0..0..0....1..0..0..0..0..0..0....0..0..0..0..0..1..0

Crossrefs

Sequence in context: A223791 A206935 A206870 * A223977 A188565 A207087

Adjacent sequences: A181220 A181221 A181222 * A181224 A181225 A181226

Keyword

nonn

Author

R. H. Hardin Oct 10 2010

Status

approved