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A209850
1/4 the number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having one or four distinct clockwise edge differences
0
25, 2829, 1386131, 3111914707, 31192434742293, 1413503057063618368, 287490532338602681041344, 263539796114390477346345246841
OFFSET
1,1
COMMENTS
Diagonal of A209858
EXAMPLE
Some solutions for n=4
..3..0..3..3..0....0..2..2..1..2....1..1..1..3..2....2..1..0..1..0
..0..1..3..3..2....2..3..0..2..0....3..0..3..0..0....1..3..0..3..0
..1..3..2..0..2....3..1..1..3..0....0..1..1..3..1....0..0..1..3..1
..1..0..3..2..1....2..0..3..0..1....2..0..3..2..0....3..1..3..2..0
..3..3..1..0..2....2..3..1..3..1....3..3..1..3..0....1..2..1..3..0
CROSSREFS
Sequence in context: A145246 A082488 A363865 * A014797 A077519 A078215
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 14 2012
STATUS
approved