A203979 Number of (n+1)X4 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.

96, 864, 7776, 69984, 629856, 5668704, 51018336, 459165024, 4132485216, 37192366944, 334731302496, 3012581722464, 27113235502176, 244019119519584, 2196172075676256, 19765548681086304, 177889938129776736

Offset: 1

Author

R. H. Hardin Jan 09 2012

Keywords

• nonn

Comments

Column 3 of A203984

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..210

Formula

Empirical: a(n) = 96*9^(n-1)