A201800 Number of zero-sum nX5 -2..2 arrays with every element unequal to at most two horizontal and vertical neighbors

381, 28625, 562961, 20960485, 722587629, 27941324053, 1077779765471

Offset

1,1

Comments

Column 5 of A201803

Links

Table of n, a(n) for n=1..7.

Example

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

Crossrefs

Sequence in context: A222163 A297543 A297801 * A172848 A214896 A204861

Adjacent sequences: A201797 A201798 A201799 * A201801 A201802 A201803

Keyword

nonn

Author

R. H. Hardin Dec 05 2011

Status

approved