A201495 Number of nX7 zero-sum -2..2 arrays with rows and columns lexicographically nondecreasing.

24, 151593, 3127432827, 68110029402413, 1219998885223727883

Offset: 1

Author

R. H. Hardin Dec 02 2011

Keywords

• nonn

Comments

Column 7 of A201496

Examples

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