A304260 Number of nX5 0..1 arrays with every element unequal to 2, 3, 5 or 7 king-move adjacent elements, with upper left element zero.

0, 18, 17, 47, 116, 230, 772, 1832, 5500, 15852, 43779, 127396, 365026, 1043534, 2996686, 8607783, 24658257, 70781079, 203294560, 583065421, 1673869969, 4805473675, 13792054243, 39590426728, 113650893401, 326237378540

Offset

1,2

Comments

Column 5 of A304263.

Links

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

Example

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

Crossrefs

Cf. A304263.

Sequence in context: A384919 A029926 A070742 * A176064 A278716 A282814

Adjacent sequences: A304257 A304258 A304259 * A304261 A304262 A304263

Keyword

nonn

Author

R. H. Hardin, May 09 2018

Status

approved