A201491 Number of nX3 zero-sum -2..2 arrays with rows and columns lexicographically nondecreasing

5, 226, 9331, 301432, 7798656, 168357815, 3127432827, 51118964623, 747555368709, 9907361072523, 120219907134113, 1346895312283777, 14030077787811997, 136685387878719346, 1251770455347161910, 10823892860244631974

Offset

1,1

Comments

Column 3 of A201496

Links

R. H. Hardin, Table of n, a(n) for n = 1..90

Example

Some solutions for n=3
.-2..1..1...-2.-1.-1...-1.-1..1...-2.-1..2...-2..1..2...-2.-1..2...-2..0..0
.-2..1..1....0..0..0....1..2.-2...-1..0..1....0.-1..1...-2..1..1...-1.-1.-1
..0.-2..2....2..0..2....2..0.-2....1.-1..1....2.-1.-2...-1..1..1....1..2..2

Crossrefs

Sequence in context: A263430 A339311 A200988 * A181584 A300390 A002142

Adjacent sequences: A201488 A201489 A201490 * A201492 A201493 A201494

Keyword

nonn

Author

R. H. Hardin Dec 02 2011

Status

approved