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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
OFFSET
1,1
COMMENTS
Diagonal of A205273
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 24 2012
STATUS
approved