A216025 Number of horizontal, vertical and diagonal neighbor colorings of the odd squares of an nX2 array with new integer colors introduced in row major order.

1, 2, 2, 5, 12, 42, 136, 602, 2440, 12840, 61912, 373780, 2075312, 14050312, 87852160, 656404264, 4548247264, 37060650272, 281121815712, 2475181138384, 20358402201792, 192262536609952, 1701534399324544, 17131843186425504

Offset: 1

Author

R. H. Hardin Aug 30 2012

Keywords

• nonn

Comments

Column 2 of A216031

Examples

			Some solutions for n=5
..x..0....x..0....x..0....x..0....x..0....x..0....x..0....x..0....x..0....x..0
..1..x....0..x....1..x....0..x....1..x....1..x....0..x....0..x....1..x....1..x
..x..2....x..1....x..2....x..1....x..2....x..2....x..1....x..1....x..2....x..2
..0..x....2..x....2..x....2..x....2..x....3..x....1..x....1..x....3..x....3..x
..x..3....x..0....x..0....x..3....x..3....x..4....x..0....x..2....x..1....x..0
		

Links

• R. H. Hardin, Table of n, a(n) for n = 1..123