A203978 Number of (n+1)X(n+1) 0..2 arrays with no 2X2 subblock having equal diagonal elements or equal antidiagonal elements, and new values 0..2 introduced in row major order

6, 144, 7776, 956448, 271918944, 180709558848, 281455764775776, 1031010515432951328, 8894627860916158754400, 180980943906416856129607680

Offset

1,1

Comments

Diagonal of A203984

Links

Table of n, a(n) for n=1..10.

Example

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

Crossrefs

Sequence in context: A010043 A270504 A085905 * A090443 A307416 A133460

Adjacent sequences: A203975 A203976 A203977 * A203979 A203980 A203981

Keyword

nonn

Author

R. H. Hardin Jan 09 2012

Status

approved