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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

R. H. Hardin, Table of n, a(n) for n = 1..114

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

Adjacent sequences:  A206655 A206656 A206657 * A206659 A206660 A206661

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 11 2012

STATUS

approved

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Last modified October 27 23:25 EDT 2020. Contains 338047 sequences. (Running on oeis4.)