A318081 Number of nX7 0..1 arrays with every element unequal to 0, 1, 3 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

21, 30, 54, 132, 272, 699, 1851, 5189, 13410, 35181, 97580, 275205, 756872, 2086377, 5761955, 16140253, 44957087, 125158194, 347644080, 969683273, 2703389580, 7542883228, 21010421289, 58576761369, 163290233781, 455502716598

Offset

1,1

Comments

Column 7 of A318082.

Links

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

Example

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

Crossrefs

Cf. A318082.

Sequence in context: A317772 A308339 A186455 * A276655 A187965 A318349

Adjacent sequences: A318078 A318079 A318080 * A318082 A318083 A318084

Keyword

nonn

Author

R. H. Hardin, Aug 15 2018

Status

approved