A278273 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) or (1,0), with upper left element zero.

0, 2, 25, 1461, 350649, 329985827, 1158266740087, 15396080290130290, 772462850808202305809, 146439171275776627088638614, 104845555459822852114388229089230

Offset

1,2

Comments

Diagonal of A278280.

Links

R. H. Hardin, Table of n, a(n) for n = 1..12

Example

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

Crossrefs

Cf. A278280.

Sequence in context: A015214 A204234 A203747 * A210836 A369675 A088816

Adjacent sequences: A278270 A278271 A278272 * A278274 A278275 A278276

Keyword

nonn

Author

R. H. Hardin, Nov 16 2016

Status

approved