A209533 Half the number of (n+1)X8 0..2 arrays with every 2X2 subblock having exactly two distinct clockwise edge differences

257, 4097, 65537, 1048577, 16777217, 268435457, 4294967297, 68719476737, 1099511627777, 17592186044417, 281474976710657, 4503599627370497, 72057594037927937, 1152921504606846977, 18446744073709551617

Offset

1,1

Comments

Column 7 of A209534

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

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: A070184 A054801 A173892 * A125648 A353941 A351271

Adjacent sequences: A209530 A209531 A209532 * A209534 A209535 A209536

Keyword

nonn

Author

R. H. Hardin Mar 10 2012

Status

approved