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A204622 Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock having unequal diagonal elements or unequal antidiagonal elements, and new values 0..2 introduced in row major order 1
12, 2049, 2490558, 21550390395, 1327448018292252, 582081449451902347866, 1816995451072561641887723586, 40376415985445663379679403072064855, 6387126785648912581213165822171077074078454 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A204630

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..11

EXAMPLE

Some solutions for n=3

..0..0..0..0....0..0..0..0....0..0..0..0....0..0..0..1....0..1..1..0

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

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

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

CROSSREFS

Sequence in context: A263584 A323816 A208252 * A004823 A009063 A012675

Adjacent sequences:  A204619 A204620 A204621 * A204623 A204624 A204625

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 17 2012

STATUS

approved

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Last modified September 16 03:26 EDT 2019. Contains 327088 sequences. (Running on oeis4.)