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A204774 Number of (n+2)X(n+2) 0..2 arrays with no 3X3 subblock having three equal diagonal elements or three equal antidiagonal elements, and new values 0..2 introduced in row major order 0
2592, 2973696, 21570701058, 966430412947296, 270709468240858645320, 471676730359800501277345350, 5121078716739687209206582420410120 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A204782

LINKS

Table of n, a(n) for n=1..7.

EXAMPLE

Some solutions for n=3

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

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

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

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

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

CROSSREFS

Sequence in context: A035773 A107569 A269287 * A251899 A236598 A237163

Adjacent sequences:  A204771 A204772 A204773 * A204775 A204776 A204777

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 19 2012

STATUS

approved

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Last modified September 21 20:10 EDT 2021. Contains 347598 sequences. (Running on oeis4.)