A201983 - OEIS

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A201983

Number of n X n zero-sum -3..3 arrays with rows and columns lexicographically nondecreasing

0

1, 77, 134217, 7375608084, 13189629907532856

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

OFFSET

1,2

COMMENTS

Diagonal of A201989

LINKS

Table of n, a(n) for n=1..5.

EXAMPLE

Some solutions for n=3

.-3.-3..1...-3.-1..0...-3..1..3...-3.-3..1...-3.-1..2...-3..0..2...-1.-1..0

..2..2.-2....0.-1..2...-3..2..0...-3..2..3...-1..1..0...-1..2.-2...-1..2.-3

..2..3.-2....2.-1..2...-2.-1..3...-2..2..3....3.-2..1....1.-1..2....2..2..0

CROSSREFS

Sequence in context: A271244 A271245 A196543 * A278370 A278654 A331630

Adjacent sequences: A201980 A201981 A201982 * A201984 A201985 A201986

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 07 2011

STATUS

approved