A302634 Number of nX7 0..1 arrays with every element equal to 0, 1, 3 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

21, 185, 83, 304, 1734, 6460, 30216, 144266, 642553, 2942184, 13568813, 61798208, 282661567, 1295223226, 5921237836, 27085485076, 123955468089, 567032990681, 2594025218639, 11868355270058, 54296922715587, 248403802340878

Offset

1,1

Comments

Column 7 of A302635.

Links

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

Example

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

Crossrefs

Cf. A302635.

Sequence in context: A219171 A232045 A302162 * A302426 A303196 A274655

Adjacent sequences: A302631 A302632 A302633 * A302635 A302636 A302637

Keyword

nonn

Author

R. H. Hardin, Apr 10 2018

Status

approved