A305640 Number of nX6 0..1 arrays with every element unequal to 0, 1, 2, 4, 5 or 6 king-move adjacent elements, with upper left element zero.

32, 284, 743, 6329, 48567, 385282, 3252937, 29925524, 280854245, 2612768319, 24785851660, 236772462876, 2251291660203, 21530551123401, 206148758486168, 1970437000025705, 18871772494554514, 180748165315349147

Offset

1,1

Comments

Column 6 of A305642.

Links

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

Example

Some solutions for n=5
..0..0..1..0..0..0. .0..1..1..1..1..1. .0..1..1..1..0..1. .0..0..0..0..1..1
..0..0..1..0..0..1. .0..1..1..0..0..1. .0..1..1..1..1..1. .0..0..1..1..1..1
..1..1..1..0..1..0. .1..1..1..0..1..0. .1..1..1..1..1..0. .0..0..1..1..1..1
..0..0..0..1..0..0. .0..1..1..1..1..1. .1..1..1..1..1..0. .0..1..1..1..1..0
..0..0..1..0..0..0. .1..1..1..1..1..1. .1..1..1..1..1..1. .1..0..1..1..0..1

Crossrefs

Cf. A305642.

Sequence in context: A009526 A304345 A316216 * A317034 A305909 A317151

Adjacent sequences: A305637 A305638 A305639 * A305641 A305642 A305643

Keyword

nonn

Author

R. H. Hardin, Jun 07 2018

Status

approved