A201492 - OEIS

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A201492

Number of n X 4 zero-sum -2..2 arrays with rows and columns lexicographically nondecreasing.

8, 1454, 301432, 50432052, 6697376240, 732383803600, 68110029402413, 5516712973977104, 396137884984421823, 25563298281912009949, 1498543207391775400633, 80501743778622446236710

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OFFSET

1,1

COMMENTS

Column 4 of A201496.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..27

EXAMPLE

Some solutions for n=2

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

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

CROSSREFS

Cf. A201496.

Sequence in context: A282889 A225068 A270145 * A172938 A252176 A252763

Adjacent sequences: A201489 A201490 A201491 * A201493 A201494 A201495

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 02 2011

STATUS

approved