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A209821 Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock having one or two distinct values, and new values 0..2 introduced in row major order 0
8, 425, 90000, 74564193, 243825684732, 3169393696357783, 164459337509857331548, 34166144423888468476743142, 28477846744792360413696508021568, 95387294845474121466595388218025045126 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Diagonal of A209829

LINKS

Table of n, a(n) for n=1..10.

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A038781 A092868 A038782 * A024110 A132099 A186419

Adjacent sequences:  A209818 A209819 A209820 * A209822 A209823 A209824

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 13 2012

STATUS

approved

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Last modified September 17 06:41 EDT 2019. Contains 327119 sequences. (Running on oeis4.)