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

8, 425, 90000, 74564193, 243825684732, 3169393696357783, 164459337509857331548, 34166144423888468476743142, 28477846744792360413696508021568, 95387294845474121466595388218025045126

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