A303887 Number of nX7 0..1 arrays with every element unequal to 0, 2, 3 or 4 king-move adjacent elements, with upper left element zero.

1, 908, 684, 7433, 16431, 88901, 308271, 1437397, 5832957, 25738579, 111298625, 488061118, 2160741927, 9505071631, 42622781668, 188580476451, 852064649176, 3793761243474, 17225448118492, 77154233211504, 351491360516174

Offset

1,2

Comments

Column 7 of A303888.

Links

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

Example

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

Crossrefs

Cf. A303888.

Sequence in context: A253354 A204613 A204797 * A305280 A304893 A316575

Adjacent sequences: A303884 A303885 A303886 * A303888 A303889 A303890

Keyword

nonn

Author

R. H. Hardin, May 02 2018

Status

approved