A201986 Number of nX4 zero-sum -3..3 arrays with rows and columns lexicographically nondecreasing.

18, 14107, 11648559, 7375608084, 3674187761233, 1507315600099908, 526500713340421071, 160321266022658991751, 43304255513243305231273, 10515069913569825177115136, 2319701107323309166913311672

Offset: 1

Author

R. H. Hardin Dec 07 2011

Keywords

• nonn

Comments

Column 4 of A201989

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..12