A269207 Number of 7Xn 0..3 arrays with some element plus some horizontally, diagonally or antidiagonally adjacent neighbor totalling three no more than once.

16384, 8787660, 2380537188, 672230393004, 179867149105740, 47121391706947500, 12093315071771856492, 3057161412747926879388, 763401355846887190121676, 188738443220730807440394588, 46278051540027048274339056012

Offset

1,1

Comments

Row 7 of A269201.

Links

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

Example

Some solutions for n=2
..0..0. .0..0. .0..0. .0..0. .0..0. .0..0. .0..0. .0..0. .0..0. .0..0
..0..0. .0..0. .0..0. .0..0. .0..0. .0..0. .0..0. .0..0. .0..0. .0..0
..2..2. .1..0. .0..1. .3..1. .0..1. .0..0. .0..0. .2..0. .1..1. .2..2
..0..2. .0..0. .0..0. .3..2. .0..1. .2..0. .0..0. .2..2. .1..3. .2..0
..2..1. .2..2. .2..0. .0..1. .3..1. .2..2. .0..2. .1..0. .1..3. .2..0
..0..2. .1..3. .2..3. .0..2. .3..3. .0..0. .0..0. .0..0. .3..1. .2..3
..3..1. .1..3. .1..3. .3..2. .0..2. .1..1. .0..2. .2..0. .3..2. .2..3

Crossrefs

Cf. A269201.

Sequence in context: A017692 A010802 A236222 * A016963 A224396 A224029

Adjacent sequences: A269204 A269205 A269206 * A269208 A269209 A269210

Keyword

nonn

Author

R. H. Hardin, Feb 20 2016

Status

approved