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A204145 Number of (n+2)X(n+2) 0..2 arrays with every 3X3 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..2 introduced in row major order 0
689, 28982, 844136, 26497814, 839477288, 25723818038, 770374556792, 23033174207414, 678601817988824 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A204153

LINKS

Table of n, a(n) for n=1..9.

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Sequence in context: A204146 A259512 A078877 * A284284 A115177 A263114

Adjacent sequences:  A204142 A204143 A204144 * A204146 A204147 A204148

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 11 2012

STATUS

approved

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Last modified May 31 07:22 EDT 2020. Contains 334747 sequences. (Running on oeis4.)