A304018 Number of nX7 0..1 arrays with every element unequal to 1, 2, 3 or 5 king-move adjacent elements, with upper left element zero.

8, 928, 2421, 16187, 87747, 488944, 2820436, 16004647, 90893514, 522170664, 2984588588, 17090064690, 97994342628, 561581968676, 3219331039992, 18459890079828, 105841123581413, 606904072842495, 3480160483828364

Offset

1,1

Comments

Column 7 of A304019.

Links

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

Example

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

Crossrefs

Cf. A304019.

Sequence in context: A146536 A189646 A348795 * A305366 A304958 A316640

Adjacent sequences: A304015 A304016 A304017 * A304019 A304020 A304021

Keyword

nonn

Author

R. H. Hardin, May 04 2018

Status

approved