A240518 Number of nX7 0..1 arrays with no element equal to exactly two horizontal and vertical neighbors, with new values 0..1 introduced in row major order.

21, 86, 515, 3765, 28942, 231665, 1906245, 16000486, 135790448, 1158315893, 9946076742, 85823282205, 743139183617, 6451236349918, 56119492560507, 488978060398481, 4265874977466648, 37250999894755072, 325525391487428809

Offset: 1

Author

R. H. Hardin, Apr 06 2014

Keywords

• nonn

Comments

Column 7 of A240519

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..169