A202044 Number of zero-sum nX5 -1..1 arrays with every element unequal to at most two horizontal and vertical neighbors

51, 1593, 19541, 359017, 6221993, 119412837, 2229078023, 43322352587, 834780981463, 16419276700137, 322292535850539, 6395286541286533, 126942458619056105, 2535214795070175713, 50692230117983107173

Offset

1,1

Comments

Column 5 of A202047

Links

R. H. Hardin, Table of n, a(n) for n = 1..19

Example

Some solutions for n=3
.-1..0..0..0..1...-1.-1..1.-1.-1....1..1..0..0..1...-1..1.-1.-1.-1
..1..1..1..0..0....1..1..1..0..0...-1.-1.-1..0..0...-1..1..1..1..1
.-1.-1..1.-1.-1....1..0..0..0.-1....1..1.-1..0.-1....1..1.-1.-1..0

Crossrefs

Sequence in context: A231648 A017767 A017714 * A238319 A014943 A278623

Adjacent sequences: A202041 A202042 A202043 * A202045 A202046 A202047

Keyword

nonn

Author

R. H. Hardin Dec 10 2011

Status

approved