A184030 1/16 the number of (n+1)X(n+1) 0..3 arrays with all 2X2 subblocks having the same four values

16, 40, 82, 166, 322, 634, 1234, 2434, 4786, 9490, 18802, 37426, 74482

Offset

1,1

Comments

Diagonal of A184039

Links

Table of n, a(n) for n=1..13.

Example

Some solutions for 4X4
..1..3..1..1....3..0..3..0....2..2..2..2....0..0..0..0....1..0..0..0
..1..1..1..3....0..1..0..1....1..3..1..3....2..2..2..2....0..2..1..2
..1..3..1..1....0..3..0..3....2..2..2..2....0..0..0..0....1..0..0..0
..1..1..1..3....1..0..1..0....3..1..3..1....2..2..2..2....0..2..1..2

Crossrefs

Sequence in context: A174321 A258258 A086046 * A350284 A182461 A205065

Adjacent sequences: A184027 A184028 A184029 * A184031 A184032 A184033

Keyword

nonn

Author

R. H. Hardin Jan 08 2011

Status

approved