A300681 Number of nX7 0..1 arrays with every element equal to 0, 2, 3 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

1, 74, 131, 729, 6686, 54361, 494771, 4174087, 37464671, 329141039, 2923001082, 26034480835, 231283871073, 2056909000750, 18288923262193, 162634964488741, 1446254340101947, 12860864631967374, 114369341426371921

Offset

1,2

Comments

Column 7 of A300682.

Links

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

Example

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

Crossrefs

Cf. A300682.

Sequence in context: A333100 A270340 A300379 * A309143 A365201 A044325

Adjacent sequences: A300678 A300679 A300680 * A300682 A300683 A300684

Keyword

nonn

Author

R. H. Hardin, Mar 11 2018

Status

approved