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A210292
Half the number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having at most one duplicate clockwise edge difference
0
112, 78628, 688122928, 75244563204398, 102755730987812117952, 1752648993312488853687634462, 373366766716480043025684339650029800, 993411552731407131616878668696108769698390398
OFFSET
1,1
COMMENTS
Diagonal of A210300
EXAMPLE
Some solutions for n=4
..2..1..0..3..3....3..2..2..1..1....1..1..3..3..0....1..2..0..2..2
..3..3..3..2..1....3..2..0..1..0....3..1..1..3..2....1..0..3..2..3
..3..1..3..0..0....3..3..1..3..2....1..1..2..0..3....0..2..3..3..0
..1..0..2..0..1....2..1..1..2..2....2..3..3..0..0....1..2..3..2..3
..0..2..1..1..1....0..1..3..1..3....2..1..3..2..0....1..1..1..3..3
CROSSREFS
Sequence in context: A051363 A362963 A304394 * A270146 A184898 A270113
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 19 2012
STATUS
approved