A318061 Number of nXn 0..1 arrays with every element unequal to 1, 2, 3 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

0, 5, 98, 7170, 1405892, 824452611, 1415459855958, 7157366531123400, 106446951098115244867, 4657843289298337507871141, 599615985241029931750858863964

Offset

1,2

Comments

Diagonal of A318068.

Links

Table of n, a(n) for n=1..11.

Example

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

Crossrefs

Cf. A318068.

Sequence in context: A332695 A301307 A277418 * A147539 A266610 A156276

Adjacent sequences: A318058 A318059 A318060 * A318062 A318063 A318064

Keyword

nonn

Author

R. H. Hardin, Aug 15 2018

Status

approved