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A209806
Number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having two distinct values, and new values 0..3 introduced in row major order
0
7, 302, 43209, 20873080, 32449786403, 163050586738067, 2632434564856390561, 137193223429735040307661
OFFSET
1,1
COMMENTS
Diagonal of A209814
EXAMPLE
Some solutions for n=4
..0..1..0..2..1....0..0..0..0..0....0..0..1..0..0....0..0..0..0..0
..0..0..0..2..1....0..1..0..1..0....0..1..0..0..2....0..1..0..2..2
..0..3..0..2..2....0..0..0..0..0....0..0..0..2..0....0..0..0..0..2
..3..3..0..0..2....0..1..0..1..0....1..1..0..2..2....1..0..1..0..2
..0..3..0..2..2....0..0..1..0..1....0..0..0..0..0....0..0..1..0..0
CROSSREFS
Sequence in context: A096348 A281435 A015005 * A257919 A002437 A376464
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 13 2012
STATUS
approved