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A203828 Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements 0
45, 1971, 270333, 119606211, 173185290765, 827309554361235, 13102412661293146461, 690154670186627261773347 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A203835

LINKS

Table of n, a(n) for n=1..8.

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A049397 A215859 A143170 * A318221 A162885 A163231

Adjacent sequences:  A203825 A203826 A203827 * A203829 A203830 A203831

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 06 2012

STATUS

approved

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Last modified June 19 19:11 EDT 2019. Contains 324222 sequences. (Running on oeis4.)