A205311 Number of (n+1) X (n+1) 0..1 arrays with every 2 X 2 subblock having the same number of equal edges, and new values 0..1 introduced in row major order.

8, 84, 2606, 193664, 33865634, 13956665238, 13574876544398, 31191658416342676, 169426507164530254382, 2176592549084872196370726, 66158464020552857153017287242, 4759146677426447759184119036493678

Offset

1,1

Comments

Diagonal of A205318.

Links

R. H. Hardin, Table of n, a(n) for n = 1..14

Example

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

Crossrefs

Cf. A205318.

Sequence in context: A346684 A350264 A113376 * A258338 A245197 A281340

Adjacent sequences: A205308 A205309 A205310 * A205312 A205313 A205314

Keyword

nonn

Author

R. H. Hardin Jan 25 2012

Status

approved