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A204484 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 exactly one way, and new values 0..1 introduced in row major order 0
72, 511, 2547, 11137, 43620, 169432, 658793, 2543298, 9877925, 38441749, 149816511, 585601752, 2290712744, 8967902015, 35126111858 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A204492

LINKS

Table of n, a(n) for n=1..15.

EXAMPLE

Some solutions for n=3

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

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

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

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

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

CROSSREFS

Sequence in context: A187158 A164377 A156632 * A235178 A085718 A205329

Adjacent sequences:  A204481 A204482 A204483 * A204485 A204486 A204487

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 15 2012

STATUS

approved

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Last modified November 29 18:41 EST 2021. Contains 349416 sequences. (Running on oeis4.)