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A205266 Number of (n+2)X3 0..1 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically or nw-to-se diagonally, and new values 0..1 introduced in row major order 1
223, 1606, 11553, 82991, 596414, 4285989, 30799890, 221334561, 1590556222, 11430067537, 82138844381, 590266825510, 4241780221403, 30482315247698, 219052259713035, 1574155115721354, 11312206190476013, 81291867375432163 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A205273

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 6*a(n-1) +5*a(n-2) +26*a(n-3) -6*a(n-4) +14*a(n-5) -44*a(n-6) +23*a(n-7) +10*a(n-8) -15*a(n-9) -12*a(n-10) -12*a(n-11)

EXAMPLE

Some solutions for n=3

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

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

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

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

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

CROSSREFS

Sequence in context: A158226 A253953 A205273 * A152834 A139233 A205265

Adjacent sequences:  A205263 A205264 A205265 * A205267 A205268 A205269

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 24 2012

STATUS

approved

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Last modified April 18 17:25 EDT 2021. Contains 343089 sequences. (Running on oeis4.)