A302315 Number of 7Xn 0..1 arrays with every element equal to 0, 1, 3 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

64, 86, 336, 1090, 3915, 18990, 76642, 360898, 1695748, 9408402, 50431855, 270054791, 1483688723, 8638547369, 49555516908, 278416318505, 1587868618303, 9269491523649, 53654294707162, 306415770314870, 1762671922872075

Offset

1,1

Comments

Row 7 of A302309.

Links

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

Example

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

Crossrefs

Cf. A302309.

Sequence in context: A302640 A302432 A303202 * A303045 A302882 A303530

Adjacent sequences: A302312 A302313 A302314 * A302316 A302317 A302318

Keyword

nonn

Author

R. H. Hardin, Apr 05 2018

Status

approved