A222877 Number of nX7 0..3 arrays with no more than floor(nX7/2) elements equal to at least one horizontal or antidiagonal neighbor, with new values introduced in row major 0..3 order.

438, 6013669, 66248732403, 1036481888251762, 11989849992460360377, 192967638304466060567720, 2288814374497410957902034456, 37306843891418465461998644495695, 449110977900671215379544970452138247

Offset: 1

Author

R. H. Hardin Mar 08 2013

Keywords

• nonn

Comments

Column 7 of A222878

Examples

			Some solutions for n=3
..0..0..0..0..1..2..0....0..0..0..0..1..2..3....0..0..0..0..1..2..3
..0..0..0..3..1..1..0....0..0..0..0..3..1..2....0..0..0..3..1..2..3
..0..1..0..3..2..1..3....0..0..1..0..2..3..0....0..1..0..2..3..2..0
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..13