A202045 Number of zero-sum nX6 -1..1 arrays with every element unequal to at most two horizontal and vertical neighbors

141, 7669, 149149, 4188917, 119412837, 3573771563, 108356007319, 3336377520415, 103795034576253, 3257057281323371

Offset

1,1

Comments

Column 6 of A202047

Links

Table of n, a(n) for n=1..10.

Example

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

Crossrefs

Sequence in context: A005849 A172633 A221104 * A066623 A302331 A172738

Adjacent sequences: A202042 A202043 A202044 * A202046 A202047 A202048

Keyword

nonn

Author

R. H. Hardin Dec 10 2011

Status

approved