A302386 Number of 7Xn 0..1 arrays with every element equal to 1, 2, 3 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

0, 1172, 97160, 5421003, 404225195, 29810775827, 2195619257236, 161767569162389, 11926561967149057, 879261959837334277, 64822173992483793756, 4778918571861830147396, 352319630303338775663571

Offset

1,2

Comments

Row 7 of A302381.

Links

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

Example

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

Crossrefs

Cf. A302381.

Sequence in context: A302477 A303258 A230738 * A303107 A302958 A232082

Adjacent sequences: A302383 A302384 A302385 * A302387 A302388 A302389

Keyword

nonn

Author

R. H. Hardin, Apr 06 2018

Status

approved