A278286 Number of 7Xn 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, 476, 30370, 2293193, 180592726, 14526103064, 1158266740087, 92512375832471, 7385561338360758, 589775066919535309, 47090974186795340550, 3760172975855159952403, 300241490821466632869029

Offset

1,2

Comments

Row 7 of A278280.

Links

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

Example

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

Crossrefs

Cf. A278280.

Sequence in context: A235656 A264290 A181228 * A216141 A325822 A224453

Adjacent sequences: A278283 A278284 A278285 * A278287 A278288 A278289

Keyword

nonn

Author

R. H. Hardin, Nov 16 2016

Status

approved