A205162 Number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having unequal diagonal elements or unequal antidiagonal elements, and new values 0..3 introduced in row major order

13, 8479, 100138314, 16713430246949, 39233079877190973984, 1295254361100907855849613402, 601414054429072205807810003186176794

Offset

1,1

Comments

Diagonal of A205170

Links

Table of n, a(n) for n=1..7.

Example

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

Crossrefs

Sequence in context: A060887 A020521 A208169 * A122429 A173506 A173840

Adjacent sequences: A205159 A205160 A205161 * A205163 A205164 A205165

Keyword

nonn

Author

R. H. Hardin Jan 22 2012

Status

approved