A318067 Number of nX7 0..1 arrays with every element unequal to 1, 2, 3 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

8, 3437, 156846, 8929364, 479322719, 26085599617, 1415459855958, 76853282341918, 4172233315256556, 226510081564552681, 12297129345031936573, 667606422952950882889, 36244085742172846775059, 1967677047744653756690408

Offset

1,1

Comments

Column 7 of A318068.

Links

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

Example

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

Crossrefs

Cf. A318068.

Sequence in context: A299838 A299727 A046250 * A295170 A087925 A125540

Adjacent sequences: A318064 A318065 A318066 * A318068 A318069 A318070

Keyword

nonn

Author

R. H. Hardin, Aug 15 2018

Status

approved