A278176 Number of nX7 0..1 arrays with every element both equal and not equal to some elements at offset (-1,0) (-1,1) (0,-1) (0,1) (1,-1) or (1,0), with upper left element zero.

0, 436, 27692, 2419304, 209105063, 18218081491, 1580935773900, 137264328312479, 11916307472109969, 1034507705866421424, 89809589733457630488, 7796723202173710849973, 676863948079571480111201

Offset

1,2

Comments

Column 7 of A278177.

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

Some solutions for n=3
..0..0..0..1..0..0..0. .0..1..1..1..0..1..0. .0..1..1..0..1..1..0
..1..0..1..0..0..1..0. .0..0..1..1..0..1..0. .0..1..0..1..1..1..0
..1..0..0..1..1..1..0. .0..1..1..0..0..1..0. .1..1..1..0..0..1..1

Crossrefs

Cf. A278177.

Sequence in context: A234221 A255777 A283928 * A243233 A216988 A190828

Adjacent sequences: A278173 A278174 A278175 * A278177 A278178 A278179

Keyword

nonn

Author

R. H. Hardin, Nov 13 2016

Status

approved