A222452 Number of nX4 0..1 arrays with exactly floor(nX4/2) elements unequal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..1 order.

3, 7, 17, 101, 426, 1722, 8483, 46788, 246899, 1263032, 6568737, 34802586, 184657217, 976867173, 5178449568, 27557967928, 146974586179, 784645686795, 4194027064034, 22450449919571, 120330101083792, 645608703621958

Offset: 1

Author

R. H. Hardin Feb 20 2013

Keywords

• nonn

Comments

Column 4 of A222456

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..204