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A204344 Number of (n+2)X3 0..3 arrays with no 3X3 subblock having three equal diagonal elements or three equal antidiagonal elements, and new values 0..3 introduced in row major order 1
9672, 540324, 30378276, 1708802980, 96125591660, 5407387617220, 304183813284988, 17111367047366980, 962572201416127452, 54147938064056337924, 3046004437189115857116, 171348039521073113161540 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A204351

LINKS

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

FORMULA

Empirical: a(n) = 62*a(n-1) -285*a(n-2) -2404*a(n-3) +14308*a(n-4) -9048*a(n-5) -23940*a(n-6) +27216*a(n-7) -7056*a(n-8)

EXAMPLE

Some solutions for n=3

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

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

..1..0..1....0..1..1....2..0..1....1..0..1....1..1..1....1..0..2....2..0..3

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

..1..1..3....0..1..1....3..1..0....2..1..1....3..0..2....2..2..0....2..0..1

CROSSREFS

Sequence in context: A183851 A238036 A204351 * A204343 A068362 A246228

Adjacent sequences:  A204341 A204342 A204343 * A204345 A204346 A204347

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 14 2012

STATUS

approved

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Last modified November 28 06:23 EST 2020. Contains 338699 sequences. (Running on oeis4.)