A201494 Number of nX6 zero-sum -2..2 arrays with rows and columns lexicographically nondecreasing.

18, 36487, 168357815, 732383803600, 2571822263246639, 7383126698273869479

Offset: 1

Author

R. H. Hardin Dec 02 2011

Keywords

• nonn

Comments

Column 6 of A201496

Examples

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