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A204506 Number of (n+2)X3 0..2 arrays with every 3X3 subblock having three equal elements in a row horizontally, vertically, diagonally or antidiagonally at least two different ways, and new values 0..2 introduced in row major order 1
652, 7344, 87869, 874124, 9306965, 100389366, 1060442883, 11271249888, 120052570303, 1275730046456, 13563758693425, 144255141981930, 1533811867037061, 16309155546072010, 173423544254444655 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A204511

LINKS

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

FORMULA

Empirical: a(n) = 11*a(n-1) -8*a(n-2) +184*a(n-3) -1610*a(n-4) +1016*a(n-5) -1186*a(n-6) +42250*a(n-7) -28003*a(n-8) -97163*a(n-9) -310078*a(n-10) +259130*a(n-11) +2103542*a(n-12) -1180456*a(n-13) -3192352*a(n-14) -10472484*a(n-15) +21487392*a(n-16) +17418200*a(n-17) -12454816*a(n-18) -27103840*a(n-19) -50486880*a(n-20) +33266176*a(n-21) +68955392*a(n-22) +21755136*a(n-23) -41044736*a(n-24) -44105216*a(n-25) +8871936*a(n-26) +14843904*a(n-27) +1474560*a(n-28)

EXAMPLE

Some solutions for n=3

..0..0..0....0..0..0....0..0..0....0..1..2....0..0..0....0..0..0....0..0..0

..0..0..1....0..0..0....0..0..0....1..2..2....0..0..1....0..0..0....0..0..1

..1..1..0....0..0..0....0..0..0....2..2..2....1..0..0....0..0..0....2..1..0

..1..1..1....1..0..0....1..2..0....0..2..1....1..0..0....0..1..1....1..1..1

..1..1..0....0..2..2....2..1..0....2..0..1....1..2..0....0..2..2....0..1..2

CROSSREFS

Sequence in context: A127030 A127031 A204511 * A282558 A204505 A188414

Adjacent sequences:  A204503 A204504 A204505 * A204507 A204508 A204509

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 15 2012

STATUS

approved

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Last modified October 22 04:29 EDT 2018. Contains 316431 sequences. (Running on oeis4.)