A204864 Number of (n+2)X7 0..1 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically, diagonally or antidiagonally exactly two different ways, and new values 0..1 introduced in row major order

20113, 136899, 1013668, 7620885, 59491439, 462259671, 3572132537, 27779761123, 216129338685, 1675476437558, 13027242027202, 101268097797410, 786267089036436, 6110786429125854, 47489850472550153, 368897712406751027

Offset

1,1

Comments

Column 5 of A204867

Links

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

Example

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

Crossrefs

Sequence in context: A251880 A186565 A186480 * A353034 A348346 A145535

Adjacent sequences: A204861 A204862 A204863 * A204865 A204866 A204867

Keyword

nonn

Author

R. H. Hardin Jan 20 2012

Status

approved