A304893 Number of nX7 0..1 arrays with every element unequal to 0, 2, 3, 4 or 7 king-move adjacent elements, with upper left element zero.

1, 908, 776, 18773, 86300, 793698, 7309444, 56105221, 545744025, 4501996186, 40822487746, 356527024641, 3135277472780, 27735274590050, 243518991915673, 2150034839444859, 18927252511729349, 166813401206430162

Offset

1,2

Comments

Column 7 of A304894.

Links

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

Example

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

Crossrefs

Cf. A304894.

Sequence in context: A204797 A303887 A305280 * A316575 A304550 A316375

Adjacent sequences: A304890 A304891 A304892 * A304894 A304895 A304896

Keyword

nonn

Author

R. H. Hardin, May 20 2018

Status

approved