A204353 Number of (n+2)X(n+2) 0..1 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically, diagonally or antidiagonally exactly one way, and new values 0..1 introduced in row major order

74, 713, 5516, 29977, 174154, 1006754, 5145580, 25995176, 133684004, 707201520, 3661939020, 18948360322, 97881117718, 510078073616, 2645150326944, 13723850334058, 71090541203488, 369204600318682, 1915031044755598

Offset

1,1

Comments

Diagonal of A204361

Links

Table of n, a(n) for n=1..19.

Example

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

Crossrefs

Sequence in context: A280402 A250913 A186124 * A300487 A222861 A242146

Adjacent sequences: A204350 A204351 A204352 * A204354 A204355 A204356

Keyword

nonn

Author

R. H. Hardin Jan 14 2012

Status

approved