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A209840
Number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having one or two distinct values, and new values 0..3 introduced in row major order
0
8, 451, 115435, 128454587, 595515461627, 11360964645748987, 886072158946966616059, 282112635103346805387587595
OFFSET
1,1
COMMENTS
Diagonal of A209848
EXAMPLE
Some solutions for n=4
..0..0..0..0..0....0..0..0..0..1....0..0..0..0..1....0..1..1..1..1
..0..0..1..1..0....1..0..0..1..0....0..0..2..0..0....0..0..0..0..1
..1..0..0..1..0....0..0..0..0..0....1..0..2..0..3....2..0..0..1..0
..0..0..1..1..0....1..1..0..0..2....0..0..2..0..3....0..2..0..0..0
..0..0..0..1..0....2..1..0..0..2....1..0..2..0..3....2..0..0..1..1
CROSSREFS
Sequence in context: A012740 A042525 A028449 * A187049 A367707 A221157
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 14 2012
STATUS
approved