A301394 Number of n X n 0..1 arrays with every element equal to 2, 3, 4, 5 or 6 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

0, 1, 3, 78, 4857, 885003, 528025038, 956047339302, 5338842851150762, 91544753173766016191, 4821728266187979354515714

Offset

1,3

Comments

Diagonal of A301400.

Links

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

Example

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

Crossrefs

Cf. A301400.

Sequence in context: A097802 A119200 A197888 * A271182 A306817 A306818

Adjacent sequences: A301391 A301392 A301393 * A301395 A301396 A301397

Keyword

nonn

Author

R. H. Hardin, Mar 20 2018

Status

approved