A318044 Number of nX7 0..1 arrays with every element unequal to 0, 2, 3 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

1, 46, 1648, 42793, 1304057, 37826270, 1097286743, 32035215365, 933917327711, 27217103197673, 793339183054443, 23124520193958899, 674035058682860528, 19646860749850864344, 572669260893508995369, 16692235797793244881719

Offset

1,2

Comments

Column 7 of A318045.

Links

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

Example

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

Crossrefs

Cf. A318045.

Sequence in context: A308101 A291129 A115608 * A263190 A364119 A331707

Adjacent sequences: A318041 A318042 A318043 * A318045 A318046 A318047

Keyword

nonn

Author

R. H. Hardin, Aug 13 2018

Status

approved