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A210154
1/4 the number of (n+1)X7 0..3 arrays with every 2X2 subblock having one, three or four distinct clockwise edge differences
1
34976109, 311831135649, 2769555432882273, 24608360596681275093, 218642562001425020608504, 1942625963195375544523109688, 17260102700582704755575246996125, 153354879298497422249886218777326738
OFFSET
1,1
COMMENTS
Column 6 of A210156
LINKS
EXAMPLE
Some solutions for n=4
..0..2..3..2..3..3..2....1..1..2..1..0..2..3....0..1..0..2..1..2..2
..3..0..0..2..2..3..2....2..2..0..1..1..1..3....3..1..0..0..2..0..0
..2..0..2..1..0..1..2....2..2..2..3..1..2..0....1..1..1..1..3..0..1
..1..3..2..1..3..0..0....1..0..2..0..3..3..0....1..2..2..3..2..2..0
..1..0..2..1..0..0..3....3..3..0..3..1..3..0....2..2..0..3..3..2..2
CROSSREFS
Sequence in context: A289957 A263893 A250573 * A216399 A015379 A147714
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 18 2012
STATUS
approved