A201988 Number of nX6 zero-sum -3..3 arrays with rows and columns lexicographically nondecreasing.

58, 1177568, 46034224561, 1507315600099908, 38785259210265819578

Offset: 1

Author

R. H. Hardin Dec 07 2011

Keywords

• nonn

Comments

Column 6 of A201989

Examples

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