A204622 Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock having unequal diagonal elements or unequal antidiagonal elements, and new values 0..2 introduced in row major order.

12, 2049, 2490558, 21550390395, 1327448018292252, 582081449451902347866, 1816995451072561641887723586, 40376415985445663379679403072064855, 6387126785648912581213165822171077074078454

Offset: 1

Author

R. H. Hardin Jan 17 2012

Keywords

• nonn

Comments

Diagonal of A204630

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..11