A305481 Number of nX7 0..1 arrays with every element unequal to 0, 1, 3, 6 or 8 king-move adjacent elements, with upper left element zero.

21, 103, 125, 368, 1245, 3910, 11438, 34687, 106558, 317866, 952180, 2866802, 8566865, 25602599, 76565334, 228533963, 682228237, 2036249074, 6073671043, 18119697325, 54049396886, 161180119634, 480704637867, 1433586580256

Offset

1,1

Comments

Column 7 of A305482.

Links

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

Example

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

Crossrefs

Cf. A305482.

Sequence in context: A303681 A304132 A304220 * A219385 A219297 A160082

Adjacent sequences: A305478 A305479 A305480 * A305482 A305483 A305484

Keyword

nonn

Author

R. H. Hardin, Jun 02 2018

Status

approved