A304012 Number of n X n 0..1 arrays with every element unequal to 1, 2, 3 or 5 king-move adjacent elements, with upper left element zero.

0, 7, 38, 370, 5162, 99733, 2820436, 106817959, 5516875986, 403632644584

Offset

1,2

Comments

Diagonal of A304019.

Links

Table of n, a(n) for n=1..10.

Example

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

Crossrefs

Cf. A304019.

Sequence in context: A354340 A229126 A158576 * A329528 A215441 A027482

Adjacent sequences: A304009 A304010 A304011 * A304013 A304014 A304015

Keyword

nonn

Author

R. H. Hardin, May 04 2018

Status

approved