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A210148
1/4 the number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having one, three or four distinct clockwise edge differences
1
57, 42689, 417014920, 53276322556234, 88975418528153598168, 1942625963195375544523109688, 554481819709548465938736952622972588, 2069021570186779275218664788818854684235583075
OFFSET
1,1
COMMENTS
Diagonal of A210156
LINKS
EXAMPLE
Some solutions for n=4
..3..1..0..0..1....3..1..3..1..3....0..0..3..0..0....1..1..3..2..0
..1..1..1..2..2....3..3..2..1..1....1..1..1..3..3....3..3..0..2..3
..3..0..3..3..0....3..2..0..0..1....3..2..0..0..2....2..1..1..2..1
..0..0..3..3..2....1..1..1..2..1....1..1..3..1..0....1..1..2..0..3
..1..0..1..0..2....2..3..0..2..2....0..1..0..2..0....0..0..2..1..1
CROSSREFS
Sequence in context: A218662 A331015 A093257 * A261948 A069255 A065869
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 18 2012
STATUS
approved