A222511 Number of 3Xn 0..1 arrays with exactly floor(3Xn/2) elements unequal to at least one horizontal, diagonal or antidiagonal neighbor, with new values introduced in row major 0..1 order.

0, 4, 4, 15, 35, 170, 441, 2192, 5416, 26660, 66209, 328121, 816736, 4074688, 10172187, 51053330, 127212627, 643151980, 1598614930, 8135779154, 20183768037, 103256080822, 255983883834, 1314494576457, 3259213240495, 16780895442470

Offset: 1

Author

R. H. Hardin Feb 23 2013

Keywords

• nonn

Comments

Row 3 of A222509

Examples

			All solutions for n=3
..0..0..0....0..0..0....0..1..0....0..0..0
..1..0..0....0..0..1....1..1..1....0..0..0
..0..0..0....0..0..0....1..1..1....1..0..1
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..77