A209217 Number of nX2 0..7 arrays with every element value z a city block distance of exactly z from another element value z

2, 13, 115, 1468, 22738, 415695, 8685016, 187123430

Offset

1,1

Comments

Column 2 of A209218

Links

Table of n, a(n) for n=1..8.

Example

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

Crossrefs

Sequence in context: A209718 A208958 A209052 * A000180 A215715 A292437

Adjacent sequences: A209214 A209215 A209216 * A209218 A209219 A209220

Keyword

nonn

Author

R. H. Hardin Mar 06 2012

Status

approved