A203789 Number of (n+1)X2 0..3 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements

112, 784, 5488, 38416, 268912, 1882384, 13176688, 92236816, 645657712, 4519603984, 31637227888, 221460595216, 1550224166512, 10851569165584, 75960984159088, 531726889113616, 3722088223795312, 26054617566567184

Offset

1,1

Comments

Column 1 of A203796

Links

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

Formula

Empirical: a(n) = 16*7^n

Example

Some solutions for n=4
..1..1....3..1....2..1....3..1....1..2....1..1....1..3....0..0....3..2....1..0
..2..1....1..3....1..0....3..3....3..1....3..1....2..1....1..0....3..3....0..0
..1..0....2..1....3..1....3..3....3..3....0..3....0..2....0..1....1..3....0..3
..0..3....1..1....0..3....3..1....1..3....1..0....2..1....1..3....1..1....1..0
..0..0....0..1....0..0....1..1....3..3....2..1....1..0....3..0....2..1....1..1

Crossrefs

Sequence in context: A047631 A264891 A203796 * A211448 A206318 A206311

Adjacent sequences: A203786 A203787 A203788 * A203790 A203791 A203792

Keyword

nonn

Author

R. H. Hardin Jan 05 2012

Status

approved