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A210405
Number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having three or four distinct values, and new values 0..3 introduced in row major order
0
7, 2520, 7380816, 178971208720, 35812807522735456, 59168572189285825092176, 807064033391096001306908915584, 90885346773699848753942253937462269824
OFFSET
1,1
COMMENTS
Diagonal of A210413
EXAMPLE
Some solutions for n=4
..0..0..0..0..0....0..0..0..1..2....0..0..0..0..0....0..0..0..0..0
..1..2..1..2..1....1..3..1..2..3....1..2..3..2..1....1..2..1..2..3
..2..0..1..0..3....3..2..2..0..2....1..3..0..3..2....2..3..3..2..0
..2..3..1..2..1....2..1..3..0..1....3..0..1..0..2....0..0..1..2..3
..1..3..2..0..3....1..3..2..1..2....1..3..2..0..1....2..3..0..2..1
CROSSREFS
Sequence in context: A203382 A249352 A264743 * A203705 A354027 A178172
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 21 2012
STATUS
approved