A209468 Number of n X n 0..2 arrays with every element value z a city block distance of exactly z from another element value z

1, 13, 2262, 2497939, 18325569581, 997395684898288, 423899279234753748599

Offset

1,2

Comments

Diagonal of A209476

Links

Table of n, a(n) for n=1..7.

Example

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

Crossrefs

Sequence in context: A013718 A145187 A221896 * A270872 A141077 A202517

Adjacent sequences: A209465 A209466 A209467 * A209469 A209470 A209471

Keyword

nonn

Author

R. H. Hardin Mar 09 2012

Status

approved