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A204859 Number of (n+2)X(n+2) 0..1 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically, diagonally or antidiagonally exactly two different ways, and new values 0..1 introduced in row major order 0
102, 1648, 36865, 1193734, 59491439, 4356486501, 463699765823, 75133672706401 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A204867

LINKS

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

EXAMPLE

Some solutions for n=3

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

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

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

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

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

CROSSREFS

Sequence in context: A206171 A199830 A200452 * A205425 A206651 A163435

Adjacent sequences:  A204856 A204857 A204858 * A204860 A204861 A204862

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 20 2012

STATUS

approved

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Last modified July 11 01:51 EDT 2020. Contains 335600 sequences. (Running on oeis4.)