A318216 Number of nXn 0..1 arrays with every element unequal to 2, 3, 4 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

0, 1, 4, 174, 24576, 12458503, 21578384304, 127593300875084, 2578465118138197116, 178097203297601659441467, 42043114501504823608330154694

Offset

1,3

Comments

Diagonal of A318222.

Links

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

Example

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

Crossrefs

Cf. A318222.

Sequence in context: A145245 A081783 A222921 * A006433 A251695 A343610

Adjacent sequences: A318213 A318214 A318215 * A318217 A318218 A318219

Keyword

nonn

Author

R. H. Hardin, Aug 21 2018

Status

approved