A209720 T(n,k)=Number of nXk 0..4 arrays with every element value z a city block distance of exactly z from another element value z

1, 2, 2, 5, 13, 5, 12, 115, 115, 12, 33, 1468, 5822, 1468, 33, 87, 19993, 411940, 411940, 19993, 87, 227, 242036, 29021568, 152691350, 29021568, 242036, 227, 583, 2830612, 1712295424

Offset

1,2

Comments

Table starts

...1......2........5........12.......33.........87.....227.583

...2.....13......115......1468....19993.....242036.2830612

...5....115.....5822....411940.29021568.1712295424

..12...1468...411940.152691350

..33..19993.29021568

..87.242036

.227

Links

Table of n, a(n) for n=1..31.

Example

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

Crossrefs

Sequence in context: A216025 A209476 A209178 * A208960 A209054 A209218

Adjacent sequences: A209717 A209718 A209719 * A209721 A209722 A209723

Keyword

nonn,tabl

Author

R. H. Hardin Mar 12 2012

Status

approved