A209950 Half the number of (n+1)X8 0..2 arrays with every 2X2 subblock having at most one duplicate clockwise edge difference

6466176, 13183187396, 26744766723116, 54342179402121844, 110373178905015566530, 224204660538155238268018, 455417252425855582254656088, 925080790192116284005812399746

Offset

1,1

Comments

Column 7 of A209951

Links

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

Example

Some solutions for n=4
..2..0..1..2..0..2..1..0....2..2..1..2..2..2..1..0....2..2..2..2..1..0..2..0
..2..1..1..1..2..2..1..2....0..1..1..1..0..1..1..0....1..2..0..1..1..2..2..1
..0..2..2..2..0..0..2..2....2..2..0..0..0..1..0..2....0..2..1..1..2..0..2..2
..2..1..1..2..0..2..2..0....1..1..1..2..0..2..2..1....1..0..2..1..1..0..2..1
..2..2..0..2..2..1..2..1....1..2..0..2..1..1..1..1....0..2..1..1..0..0..2..1

Crossrefs

Sequence in context: A254456 A254090 A254097 * A288074 A157787 A115615

Adjacent sequences: A209947 A209948 A209949 * A209951 A209952 A209953

Keyword

nonn

Author

R. H. Hardin Mar 16 2012

Status

approved