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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
0, 2, 125, 11879, 3833954, 4623938410, 20901164219657, 362655247706368404, 23827622765333417390234
OFFSET
1,2
COMMENTS
Diagonal of A209610
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
KEYWORD
nonn
AUTHOR
R. H. Hardin Mar 10 2012
STATUS
approved