A304471 Number of nX7 0..1 arrays with every element unequal to 0, 1, 2, 3 or 6 king-move adjacent elements, with upper left element zero.

64, 719, 2208, 8254, 68338, 380640, 1802240, 12149499, 76809028, 414339658, 2506312732, 15834976447, 91945106122, 542541369889, 3341140747840, 19987650956102, 118370747871295, 716642725644643, 4320134327579730

Offset

1,1

Comments

Column 7 of A304472.

Links

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

Example

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

Crossrefs

Cf. A304472.

Sequence in context: A305229 A304774 A316517 * A316288 A306052 A317229

Adjacent sequences: A304468 A304469 A304470 * A304472 A304473 A304474

Keyword

nonn

Author

R. H. Hardin, May 13 2018

Status

approved