A209602 Number of n X n 1..2 arrays with every element value z a city block distance of exactly z from another element value z

0, 2, 125, 11879, 3833954, 4623938410, 20901164219657, 362655247706368404, 23827622765333417390234

Offset

1,2

Comments

Diagonal of A209610

Links

Table of n, a(n) for n=1..9.

Example

Some solutions for n=4
..1..1..1..2....2..1..1..1....2..1..1..1....2..1..1..1....1..2..1..1
..2..2..1..1....1..1..1..1....2..2..2..2....2..1..2..2....1..2..1..2
..1..2..2..2....2..2..1..2....2..1..1..2....2..1..2..2....1..2..2..2
..1..2..1..1....2..2..2..2....2..2..1..2....2..2..2..2....1..1..1..2

Crossrefs

Sequence in context: A123006 A028481 A049659 * A237994 A348159 A157070

Adjacent sequences: A209599 A209600 A209601 * A209603 A209604 A209605

Keyword

nonn

Author

R. H. Hardin Mar 10 2012

Status

approved