A302640 Number of 7Xn 0..1 arrays with every element equal to 0, 1, 3 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

64, 86, 189, 657, 2303, 8981, 30216, 112431, 408512, 1512824, 5441957, 20021696, 73157743, 268090840, 977883198, 3582780118, 13103336584, 47949599697, 175342870194, 641714970276, 2347546538523, 8589020632731, 31421666502319

Offset

1,1

Comments

Row 7 of A302635.

Links

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

Example

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

Crossrefs

Cf. A302635.

Sequence in context: A008435 A223083 A302169 * A302432 A303202 A302315

Adjacent sequences: A302637 A302638 A302639 * A302641 A302642 A302643

Keyword

nonn

Author

R. H. Hardin, Apr 10 2018

Status

approved