A305251 Number of nX7 0..1 arrays with every element unequal to 0, 1, 3, 4 or 8 king-move adjacent elements, with upper left element zero.

21, 127, 121, 356, 1010, 2985, 9288, 29714, 94491, 302488, 974340, 3152830, 10230396, 33285406, 108488648, 354109540, 1157319070, 3786080477, 12395839066, 40611746091, 133123022408, 436560165995, 1432171781602, 4699809062692

Offset

1,1

Comments

Column 7 of A305252.

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

Crossrefs

Cf. A305252.

Sequence in context: A002299 A303807 A304854 * A316551 A304543 A306128

Adjacent sequences: A305248 A305249 A305250 * A305252 A305253 A305254

Keyword

nonn

Author

R. H. Hardin, May 28 2018

Status

approved