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A201489 Number of n X n zero-sum -2..2 arrays with rows and columns lexicographically nondecreasing 0
1, 29, 9331, 50432052, 4585552158911, 7383126698273869479 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Diagonal of A201496

LINKS

Table of n, a(n) for n=1..6.

EXAMPLE

Some solutions for n=3

.-2..0..1...-2.-2.-1...-1..0..1...-2..0..2...-1.-1..0...-2.-1.-1...-2.-1..2

.-1..0..0...-2..2..2...-1..0..2....0.-2..1...-1..2..1....0.-1..1...-2..2..2

..1..2.-1....2..2.-1....0.-2..1....0.-1..2....0..0..0....1..1..2...-1..1.-1

CROSSREFS

Sequence in context: A267909 A265464 A103656 * A028459 A199369 A127425

Adjacent sequences:  A201486 A201487 A201488 * A201490 A201491 A201492

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 02 2011

STATUS

approved

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Last modified October 27 09:08 EDT 2020. Contains 338035 sequences. (Running on oeis4.)