A222372 Number of nX1 0..3 arrays with no more than floor(nX1/2) elements unequal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..3 order.

1, 1, 1, 4, 5, 14, 17, 75, 95, 411, 519, 2522, 3211, 15919, 20299, 103627, 132515, 683480, 875491, 4554799, 5844093, 30542304, 39239961, 205785953, 264702489, 1391485044, 1791699029, 9436529666, 12161620195, 64150640719, 82742154707

Offset: 1

Author

R. H. Hardin Feb 17 2013

Keywords

• nonn

Comments

Column 1 of A222378

Examples

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

Links

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