A201801 Number of zero-sum nX6 -2..2 arrays with every element unequal to at most two horizontal and vertical neighbors

1751, 235827, 7099021, 472565771, 27941324053

Offset

1,1

Comments

Column 6 of A201803

Links

Table of n, a(n) for n=1..5.

Example

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

Crossrefs

Sequence in context: A038010 A362875 A324710 * A172833 A172882 A251892

Adjacent sequences: A201798 A201799 A201800 * A201802 A201803 A201804

Keyword

nonn

Author

R. H. Hardin Dec 05 2011

Status

approved