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A187432
Number of (n+1) X (n+1) 0..2 arrays with no 2 X 2 subblock commuting with any of its horizontal and vertical 2 X 2 subblock neighbors.
0
81, 14178, 18257013, 167339492229, 10892264636400698
OFFSET
1,1
COMMENTS
Diagonal of A187441.
EXAMPLE
Some solutions for 3 X 3
..1..1..0....1..1..2....1..1..0....2..0..2....1..0..0....1..0..1....2..1..0
..1..2..0....2..1..0....1..2..2....1..1..1....2..1..2....1..1..0....1..1..0
..2..0..1....1..1..1....1..1..1....1..0..1....2..2..2....0..2..2....1..2..2
CROSSREFS
Cf. A187441.
Sequence in context: A053905 A184690 A143005 * A017104 A243007 A143653
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 10 2011
STATUS
approved