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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 (list; graph; refs; listen; history; text; internal format)
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 A157070 A064070

Adjacent sequences:  A209599 A209600 A209601 * A209603 A209604 A209605

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 10 2012

STATUS

approved

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Last modified January 18 01:05 EST 2020. Contains 330995 sequences. (Running on oeis4.)