A222827 Number of nX4 0..3 arrays with no more than floor(nX4/2) elements equal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..3 order.

11, 1154, 163059, 23664739, 3489313607, 520160675223, 78214529020708, 11843031775865125, 1803481044258862295, 275936349234703904616, 42386246052840276405669, 6532812606151325343712993

Offset: 1

Author

R. H. Hardin Mar 06 2013

Keywords

• nonn

Comments

Column 4 of A222828

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..21