A201492 Number of n X 4 zero-sum -2..2 arrays with rows and columns lexicographically nondecreasing.

8, 1454, 301432, 50432052, 6697376240, 732383803600, 68110029402413, 5516712973977104, 396137884984421823, 25563298281912009949, 1498543207391775400633, 80501743778622446236710

Offset: 1

Author

R. H. Hardin, Dec 02 2011

Keywords

• nonn

Comments

Column 4 of A201496.

Examples

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

Links

• R. H. Hardin, Table of n, a(n) for n = 1..27

Crossrefs

Cf. A201496.