A304854 Number of nX7 0..1 arrays with every element unequal to 0, 1, 3, 4 or 7 king-move adjacent elements, with upper left element zero.

21, 127, 91, 264, 731, 2073, 6750, 23642, 80209, 281982, 1002046, 3608377, 12962477, 46720095, 168772741, 610745581, 2209961264, 8001134385, 28984697206, 105018572887, 380523339190, 1378930510442, 4997467621045, 18112318334850

Offset

1,1

Comments

Column 7 of A304855.

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

Crossrefs

Cf. A304855.

Sequence in context: A243882 A002299 A303807 * A305251 A316551 A304543

Adjacent sequences: A304851 A304852 A304853 * A304855 A304856 A304857

Keyword

nonn

Author

R. H. Hardin, May 19 2018

Status

approved