A209213 Number of nX2 1..7 arrays with every element value z a city block distance of exactly z from another element value z

1, 2, 16, 152, 1721, 24255, 399281, 6747646

Offset

1,2

Comments

Column 2 of A209215

Links

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

Example

Some solutions for n=6
..2..4....5..6....4..4....4..2....2..3....2..2....1..1....6..4....2..5....1..1
..4..5....5..1....2..4....2..3....3..2....2..2....4..1....3..2....4..3....4..2
..2..3....1..1....1..1....3..3....2..2....2..4....3..3....2..2....2..4....4..3
..1..1....1..2....2..1....3..4....2..3....1..1....3..3....2..3....1..1....2..2
..1..4....2..5....4..4....3..3....1..1....2..1....3..4....2..4....2..3....3..4
..5..3....6..5....1..1....1..1....2..1....4..1....3..3....2..6....4..5....2..4

Crossrefs

Sequence in context: A259901 A209021 A209056 * A012391 A012387 A009518

Adjacent sequences: A209210 A209211 A209212 * A209214 A209215 A209216

Keyword

nonn

Author

R. H. Hardin Mar 06 2012

Status

approved