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A206651 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 two ways, and new values 0..1 introduced in row major order 0
102, 1769, 50529, 2324028, 175401820, 21966491761, 4505251075150, 1530992805584457 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A206659

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Sequence in context: A200452 A204859 A205425 * A163435 A223308 A230737

Adjacent sequences:  A206648 A206649 A206650 * A206652 A206653 A206654

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 11 2012

STATUS

approved

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Last modified July 7 16:09 EDT 2020. Contains 335496 sequences. (Running on oeis4.)