A204774 Number of (n+2)X(n+2) 0..2 arrays with no 3X3 subblock having three equal diagonal elements or three equal antidiagonal elements, and new values 0..2 introduced in row major order

2592, 2973696, 21570701058, 966430412947296, 270709468240858645320, 471676730359800501277345350, 5121078716739687209206582420410120

Offset

1,1

Comments

Diagonal of A204782

Links

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

Example

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

Crossrefs

Sequence in context: A035773 A107569 A269287 * A251899 A236598 A237163

Adjacent sequences: A204771 A204772 A204773 * A204775 A204776 A204777

Keyword

nonn

Author

R. H. Hardin Jan 19 2012

Status

approved