A318015 Number of nX7 0..1 arrays with every element unequal to 0, 1, 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

64, 4105, 37700, 603215, 7960400, 109443619, 1493271874, 20443576030, 279709797313, 3828247661823, 52400061484204, 717264682586055, 9818436168350577, 134403118254988711, 1839845040971963605

Offset

1,1

Comments

Column 7 of A318016.

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..0..0..1..0..0..1. .0..0..0..0..1..1..0
..0..0..0..1..1..0..0. .0..0..1..1..0..0..0. .0..0..0..1..1..0..0
..0..0..1..1..1..0..0. .0..0..1..1..1..0..0. .0..0..0..1..1..0..0
..0..0..1..1..1..0..0. .0..0..1..1..1..1..1. .0..0..1..1..0..0..0
..0..0..0..0..1..1..1. .0..1..1..1..1..0..0. .0..1..1..1..0..0..1

Crossrefs

Cf. A318016.

Sequence in context: A324493 A324490 A262396 * A320401 A203438 A264345

Adjacent sequences: A318012 A318013 A318014 * A318016 A318017 A318018

Keyword

nonn

Author

R. H. Hardin, Aug 12 2018

Status

approved