A278202 Number of n X n 0..1 arrays with every element both equal and not equal to some elements at offset (-1,-1), (-1,0), (-1,1), (0,-1), (0,1), (1,-1), (1,0) or (1,1), with upper left element zero.

0, 3, 97, 8242, 3295771, 5306819216, 33056811286568, 812312404546266967, 78877646007318566942149, 30229204386668969418436705255, 45720403850059908972915757270717926

Offset

1,2

Comments

Diagonal of A278208.

Links

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

Example

Some solutions for n=4
..0..1..1..1. .0..1..0..0. .0..0..1..1. .0..1..0..0. .0..1..0..1
..0..1..0..0. .1..0..1..1. .0..1..0..0. .0..1..1..1. .0..1..1..0
..1..0..0..0. .1..1..0..1. .1..1..1..1. .0..1..0..1. .1..1..1..1
..1..1..1..0. .0..0..0..0. .1..0..0..0. .0..1..1..0. .1..0..0..1

Crossrefs

Cf. A278208.

Sequence in context: A348491 A243155 A201843 * A246537 A057014 A334723

Adjacent sequences: A278199 A278200 A278201 * A278203 A278204 A278205

Keyword

nonn

Author

R. H. Hardin, Nov 15 2016

Status

approved