A305684 Number of nX7 0..1 arrays with every element unequal to 0, 2, 3, 4, 5 or 6 king-move adjacent elements, with upper left element zero.

1, 908, 29339, 2403703, 185389115, 14724197226, 1172824606532, 93679147557172, 7488807032051960, 598902694841380350, 47903727320863846345, 3831871282738890360162, 306523980297786519252964

Offset

1,2

Comments

Column 7 of A305685.

Links

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

Example

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

Crossrefs

Cf. A305685.

Sequence in context: A316243 A305953 A317214 * A317064 A316931 A317702

Adjacent sequences: A305681 A305682 A305683 * A305685 A305686 A305687

Keyword

nonn

Author

R. H. Hardin, Jun 08 2018

Status

approved