A305647 Number of nX6 0..1 arrays with every element unequal to 0, 1, 3, 4, 5 or 6 king-move adjacent elements, with upper left element zero.

13, 125, 168, 2360, 31079, 355620, 7215825, 146459610, 2640107792, 52228665478, 1058638132393, 20748937179490, 411504304333009, 8246953247793834, 164113282013327095, 3266687021935402160, 65220671555010155571

Offset

1,1

Comments

Column 6 of A305649.

Links

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

Example

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

Crossrefs

Cf. A305649.

Sequence in context: A134550 A316237 A317158 * A316923 A317041 A317695

Adjacent sequences: A305644 A305645 A305646 * A305648 A305649 A305650

Keyword

nonn

Author

R. H. Hardin, Jun 07 2018

Status

approved