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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 0
74, 713, 5516, 29977, 174154, 1006754, 5145580, 25995176, 133684004, 707201520, 3661939020, 18948360322, 97881117718, 510078073616, 2645150326944, 13723850334058, 71090541203488, 369204600318682, 1915031044755598 (list; graph; refs; listen; history; text; internal format)
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

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Last modified February 17 21:35 EST 2020. Contains 332006 sequences. (Running on oeis4.)