A222848 Number of nX1 0..2 arrays with no more than floor(nX1/2) elements equal to at least one horizontal or vertical neighbor, with new values introduced in row major 0..2 order.

1, 1, 2, 10, 24, 72, 168, 664, 1632, 5376, 13152, 47968, 119936, 406400, 1017984, 3585408, 9082368, 30987264, 78761472, 272565760, 697493504, 2378450944, 6107523072, 20921604096, 53972262912, 183506403328, 474876108800

Offset: 1

Author

R. H. Hardin Mar 07 2013

Keywords

• nonn

Comments

Column 1 of A222853

Examples

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

Links

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