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A206092
Number of (n+1) X 7 0..2 arrays with every 2 X 3 or 3 X 2 subblock having exactly two counterclockwise and two clockwise edge increases.
1
52812, 54432, 86496, 444480, 2156544, 10584000, 56633472, 279244800, 1373929344, 7362351360, 36301824000, 178610814720, 957105676800, 4719237120000, 23219405913600, 124423737984000, 613500825600000, 3018522768768000
OFFSET
1,1
COMMENTS
Column 6 of A206094.
LINKS
FORMULA
Empirical: a(n) = 130*a(n-3) for n>9.
EXAMPLE
Some solutions for n=4:
..0..2..1..2..2..1..0....1..1..2..0..0..2..1....0..2..2..0..1..0..1
..0..2..2..0..2..2..1....0..1..1..2..0..0..2....2..2..0..1..1..0..0
..1..0..2..2..0..2..2....2..0..1..1..2..0..0....2..0..1..1..2..1..1
..1..1..0..2..2..1..1....2..2..0..1..1..2..2....0..1..1..2..1..1..2
..0..1..1..0..2..1..2....0..2..2..0..1..2..0....0..1..0..1..1..0..1
CROSSREFS
Sequence in context: A057851 A058326 A309556 * A233965 A157758 A250696
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 03 2012
STATUS
approved