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A206658 Number of (n+2)X9 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 1
332419, 4345011, 67724531, 1063970081, 17082121522, 278034719471, 4505251075150, 73239395502901, 1194646182327902, 19435034147497409, 316401277924997241, 5157671463022870073, 83984354457026854202 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 7 of A206659
LINKS
EXAMPLE
Some solutions for n=4
..0..0..0..0..0..1..0..0..1....0..0..0..1..1..1..0..0..1
..0..1..0..0..1..1..0..1..0....1..0..0..0..0..1..0..0..0
..0..1..1..1..1..1..0..0..0....1..0..1..1..0..1..0..1..1
..1..1..1..0..1..0..0..0..1....0..0..0..1..0..1..1..1..1
..1..1..0..0..0..0..0..1..1....0..0..1..1..0..0..0..0..0
..1..0..0..0..1..1..0..1..1....1..0..1..1..0..1..1..0..0
CROSSREFS
Sequence in context: A254583 A254590 A254358 * A069337 A187138 A185843
KEYWORD
nonn
AUTHOR
R. H. Hardin Feb 11 2012
STATUS
approved

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Last modified July 14 03:51 EDT 2024. Contains 374291 sequences. (Running on oeis4.)