A204623 Number of (n+1)X2 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, 96, 768, 6144, 49152, 393216, 3145728, 25165824, 201326592, 1610612736, 12884901888, 103079215104, 824633720832, 6597069766656, 52776558133248, 422212465065984, 3377699720527872, 27021597764222976, 216172782113783808

Offset: 1

Author

R. H. Hardin Jan 17 2012

Keywords

• nonn

Comments

Column 1 of A204630

Examples

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

Links

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

Crossrefs

Cf. A094085, A270568.

Formula

Empirical: a(n) = 8*a(n-1)