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A209533
Half the number of (n+1)X8 0..2 arrays with every 2X2 subblock having exactly two distinct clockwise edge differences
1
257, 4097, 65537, 1048577, 16777217, 268435457, 4294967297, 68719476737, 1099511627777, 17592186044417, 281474976710657, 4503599627370497, 72057594037927937, 1152921504606846977, 18446744073709551617
OFFSET
1,1
COMMENTS
Column 7 of A209534
LINKS
FORMULA
Empirical: a(n) = 16^(n+1)+1
EXAMPLE
Some solutions for n=4
..2..1..0..1..2..1..0..1....1..2..1..2..1..0..1..0....2..1..0..1..0..1..2..1
..1..2..1..2..1..0..1..2....2..1..2..1..2..1..2..1....1..2..1..2..1..0..1..2
..2..1..2..1..0..1..2..1....1..2..1..0..1..0..1..2....2..1..2..1..0..1..2..1
..1..2..1..2..1..0..1..0....2..1..0..1..0..1..2..1....1..2..1..0..1..2..1..2
..2..1..2..1..2..1..2..1....1..0..1..2..1..2..1..2....0..1..2..1..2..1..0..1
CROSSREFS
Sequence in context: A054801 A173892 A373468 * A125648 A353941 A351271
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 10 2012
STATUS
approved