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A204347 Number of (n+2)X6 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
1708802980, 4524628081600, 11860456910608960, 31112427702110512128, 81625476908305470240676, 214143463182606762676673040, 561805129589614687626505061188, 1473894249933463522499248333901983 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A204351

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..12

EXAMPLE

Some solutions for n=3

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

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

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

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

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

CROSSREFS

Sequence in context: A202573 A071372 A129474 * A228376 A015411 A034649

Adjacent sequences:  A204344 A204345 A204346 * A204348 A204349 A204350

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 14 2012

STATUS

approved

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Last modified May 23 19:07 EDT 2019. Contains 323528 sequences. (Running on oeis4.)