A317822 Number of nX7 0..1 arrays with every element unequal to 1, 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.

8, 1634, 3150, 48526, 179111, 1458418, 7370716, 49813114, 285365386, 1801862295, 10780737885, 66250927857, 402362478261, 2454261649360, 14947185490935, 91152367042211, 554926695836229, 3385228443629637, 20612211780845789

Offset

1,1

Comments

Column 7 of A317823.

Links

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

Example

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

Crossrefs

Cf. A317823.

Sequence in context: A229150 A160231 A213961 * A318429 A318097 A230913

Adjacent sequences: A317819 A317820 A317821 * A317823 A317824 A317825

Keyword

nonn

Author

R. H. Hardin, Aug 07 2018

Status

approved