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

18, 36487, 168357815, 732383803600, 2571822263246639, 7383126698273869479

Offset

1,1

Comments

Column 6 of A201496

Links

Table of n, a(n) for n=1..6.

Example

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

Crossrefs

Sequence in context: A296653 A255406 A123401 * A079303 A159445 A146548

Adjacent sequences: A201491 A201492 A201493 * A201495 A201496 A201497

Keyword

nonn

Author

R. H. Hardin Dec 02 2011

Status

approved