A305181 Number of nX7 0..1 arrays with every element unequal to 1, 2, 5, 6 or 7 king-move adjacent elements, with upper left element zero.

8, 22, 49, 71, 140, 836, 1750, 5407, 19965, 44251, 150549, 488420, 1217938, 3981440, 12553050, 34234337, 106068538, 331125859, 954603491, 2861242231, 8832265881, 26265684299, 77767182950, 237076601097, 715625119985, 2119273438439

Offset

1,1

Comments

Column 7 of A305182.

Links

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

Example

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

Crossrefs

Cf. A305182.

Sequence in context: A239360 A211532 A269429 * A048489 A124701 A369593

Adjacent sequences: A305178 A305179 A305180 * A305182 A305183 A305184

Keyword

nonn

Author

R. H. Hardin, May 26 2018

Status

approved