A204866 Number of (n+2)X9 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

283877, 2660367, 28334280, 309173896, 3572132537, 40833480416, 463699765823, 5337233301716, 61245366854871, 699327395092621, 8041377023804442, 92258561040986700, 1056397619905286761, 12133997044683483280

Offset

1,1

Comments

Column 7 of A204867

Links

R. H. Hardin, Table of n, a(n) for n = 1..181

Example

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

Crossrefs

Sequence in context: A321055 A185886 A235827 * A236504 A214357 A096519

Adjacent sequences: A204863 A204864 A204865 * A204867 A204868 A204869

Keyword

nonn

Author

R. H. Hardin Jan 20 2012

Status

approved