A317901 Number of nX7 0..1 arrays with every element unequal to 2, 3 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

0, 22, 6, 116, 315, 502, 3630, 7770, 34645, 86317, 320622, 966922, 3306875, 10609266, 34934092, 114138685, 374143779, 1227335831, 4020363887, 13193058120, 43248448731, 141915161267, 465495771858, 1527373960376, 5011467375946

Offset

1,2

Comments

Column 7 of A317902.

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

Some solutions for n=5
..0..1..0..1..1..0..1. .0..1..1..1..1..1..0. .0..1..0..1..1..0..1
..1..0..0..0..0..0..0. .1..0..0..0..0..0..1. .1..0..0..0..0..0..0
..0..1..0..1..0..1..0. .0..0..1..0..1..0..1. .1..0..1..0..1..0..1
..0..0..0..0..0..0..1. .1..0..0..0..0..0..0. .0..0..0..0..0..0..1
..1..0..1..1..0..1..0. .1..0..1..1..1..0..1. .1..0..1..1..0..1..0

Crossrefs

Cf. A317902.

Sequence in context: A040469 A040468 A317740 * A040467 A194708 A069285

Adjacent sequences: A317898 A317899 A317900 * A317902 A317903 A317904

Keyword

nonn

Author

R. H. Hardin, Aug 10 2018

Status

approved