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A204343 Number of (n+2)X(n+2) 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 0
9672, 109655775, 16256855591536, 31112427702110512128, 769885056390910177755092784, 246208690739288821726563895377926727 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A204351

LINKS

Table of n, a(n) for n=1..6.

EXAMPLE

Some solutions for n=3

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

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

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

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

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

CROSSREFS

Sequence in context: A238036 A204351 A204344 * A068362 A246228 A234819

Adjacent sequences:  A204340 A204341 A204342 * A204344 A204345 A204346

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 14 2012

STATUS

approved

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Last modified October 30 18:13 EDT 2020. Contains 338090 sequences. (Running on oeis4.)