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A205265 Number of (n+2)X(n+2) 0..1 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically or nw-to-se diagonally, and new values 0..1 introduced in row major order 0
223, 21537, 7191926, 8174802163, 32079295935853, 433101439309430572, 20100570131126768440800 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A205273

LINKS

Table of n, a(n) for n=1..7.

EXAMPLE

Some solutions for n=3

..0..0..1..1..1....0..0..0..0..0....0..1..0..0..1....0..0..1..0..1

..0..1..1..0..0....1..1..0..1..0....1..1..1..0..0....0..1..1..0..1

..0..0..1..0..0....1..1..1..1..1....1..0..1..1..0....0..0..0..0..0

..1..1..1..0..1....1..1..1..0..1....0..1..1..1..0....1..0..0..1..0

..1..0..1..1..0....0..0..1..0..0....1..0..1..0..1....1..1..1..0..0

CROSSREFS

Sequence in context: A205266 A152834 A139233 * A153165 A094491 A162604

Adjacent sequences:  A205262 A205263 A205264 * A205266 A205267 A205268

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 24 2012

STATUS

approved

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Last modified May 7 19:48 EDT 2021. Contains 343652 sequences. (Running on oeis4.)