A222825 Number of nX2 0..3 arrays with no more than floor(nX2/2) elements equal to at least one horizontal, vertical or antidiagonal neighbor, with new values introduced in row major 0..3 order.

1, 8, 80, 1154, 14388, 200082, 2652496, 36622104, 498427856, 6893943128, 95040804864, 1319624517920, 18325966197056, 255430185200544, 3564132957005568, 49841772120587648, 697848234833263872

Offset: 1

Author

R. H. Hardin Mar 06 2013

Keywords

• nonn

Comments

Column 2 of A222828

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..209