A304847 Number of nX7 0..1 arrays with every element unequal to 0, 1, 2, 4 or 7 king-move adjacent elements, with upper left element zero.

64, 432, 1009, 4816, 45988, 294924, 1500288, 10862979, 74522808, 445537503, 2890316757, 19411788281, 123321843070, 789295662382, 5175412707808, 33457355130603, 215064539707167, 1395577141904583, 9044156823266796

Offset

1,1

Comments

Column 7 of A304848.

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..1..0..0..0..0. .0..1..0..0..0..0..0
..1..1..1..1..1..1..1. .1..0..1..1..1..0..0. .0..0..1..0..0..1..1
..1..1..1..1..1..1..1. .1..1..1..1..1..1..1. .0..0..0..0..0..0..0
..1..1..1..1..1..0..1. .1..1..0..1..1..0..0. .0..0..0..0..0..1..1
..1..0..0..1..1..1..0. .1..0..1..1..1..1..1. .1..1..0..1..1..1..1

Crossrefs

Cf. A304848.

Sequence in context: A305244 A304478 A316303 * A316544 A306059 A188785

Adjacent sequences: A304844 A304845 A304846 * A304848 A304849 A304850

Keyword

nonn

Author

R. H. Hardin, May 19 2018

Status

approved