A205187 Number of (n+1)X2 0..1 arrays with the number of clockwise edge increases in every 2X2 subblock differing from each horizontal or vertical neighbor.

16, 24, 48, 72, 144, 216, 432, 648, 1296, 1944, 3888, 5832, 11664, 17496, 34992, 52488, 104976, 157464, 314928, 472392, 944784, 1417176, 2834352, 4251528, 8503056, 12754584, 25509168, 38263752, 76527504, 114791256, 229582512, 344373768

Offset: 1

Author

R. H. Hardin Jan 23 2012

Keywords

• nonn

Comments

Column 1 of A205193

Examples

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

Links

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

Formula

Empirical: a(n) = 3*a(n-2)