A318074 Number of nX7 0..1 arrays with every element unequal to 0, 1, 2 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

64, 190, 404, 861, 2195, 9966, 46884, 184156, 819263, 3703730, 15865269, 69944965, 310937380, 1361781447, 5998215467, 26503896368, 116659469704, 513984726015, 2266966511804, 9989194862172, 44021107304800, 194059543279029

Offset

1,1

Comments

Column 7 of A318075.

Links

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

Example

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

Crossrefs

Cf. A318075.

Sequence in context: A209371 A317763 A318342 * A202332 A208636 A135270

Adjacent sequences: A318071 A318072 A318073 * A318075 A318076 A318077

Keyword

nonn

Author

R. H. Hardin, Aug 15 2018

Status

approved