A278087 Number of n X n 0..1 arrays with every element both equal and not equal to some elements at offset (-1,0), (-1,1), (0,-1), (0,1) or (1,0), with upper left element zero.

0, 2, 16, 670, 114028, 70793904, 156188151088, 1222379234009310, 33967142249927729484, 3349734116327298689764644, 1172563716878509020533994874732

Offset

1,2

Comments

Diagonal of A278094.

Links

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

Example

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

Crossrefs

Cf. A278094.

Sequence in context: A289202 A279324 A128294 * A015188 A005118 A108400

Adjacent sequences: A278084 A278085 A278086 * A278088 A278089 A278090

Keyword

nonn

Author

R. H. Hardin, Nov 11 2016

Status

approved