A305280 Number of nX7 0..1 arrays with every element unequal to 0, 2, 3, 4 or 8 king-move adjacent elements, with upper left element zero.

1, 908, 684, 7433, 17335, 96739, 342596, 1733499, 7108688, 34070865, 151267555, 715919470, 3291923239, 15584304161, 73127361924, 347386883008, 1648683728405, 7862720736346, 37566868823980, 179759865949127, 862377975444602

Offset

1,2

Comments

Column 7 of A305281.

Links

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

Example

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

Crossrefs

Cf. A305281.

Sequence in context: A204613 A204797 A303887 * A304893 A316575 A304550

Adjacent sequences: A305277 A305278 A305279 * A305281 A305282 A305283

Keyword

nonn

Author

R. H. Hardin, May 29 2018

Status

approved