A305020 Number of nX6 0..1 arrays with every element unequal to 2, 3, 4, 5 or 7 king-move adjacent elements, with upper left element zero.

0, 209, 2000, 62314, 1575677, 42306830, 1125868355, 30031715172, 801023698345, 21369269639027, 570045639446500, 15207204397589585, 405680765015268913, 10822338608421927292, 288707417174930265988, 7701843313415562030774

Offset

1,2

Comments

Column 6 of A305022.

Links

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

Example

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

Crossrefs

Cf. A305022.

Sequence in context: A157441 A304063 A305455 * A316684 A235731 A235512

Adjacent sequences: A305017 A305018 A305019 * A305021 A305022 A305023

Keyword

nonn

Author

R. H. Hardin, May 23 2018

Status

approved