A201956 Number of zero-sum nX3 -3..3 arrays with every element unequal to at most two horizontal and vertical neighbors

37, 1587, 17091, 303955, 4735345, 85454789, 1489376611, 27222524599, 493561989579, 9124430335331, 168519041238653, 3142665027511853, 58661584782394781, 1101133968614654601, 20697996312691430763

Offset

1,1

Comments

Column 3 of A201958

Links

R. H. Hardin, Table of n, a(n) for n = 1..20

Example

Some solutions for n=3
..1.-2.-2....2..2..2....1..0..1...-1..1..1....2..3..3....2..2.-1....0.-2..3
..1..1.-2....0..0..0...-2..0..1...-1..2..2...-3.-3..3....2..0..0....1.-2..3
.-1..1..3....0.-3.-3...-2..0..1...-3..2.-3...-1.-3.-1...-2..0.-3....1.-2.-2

Crossrefs

Sequence in context: A231543 A279330 A009695 * A322097 A260667 A130013

Adjacent sequences: A201953 A201954 A201955 * A201957 A201958 A201959

Keyword

nonn

Author

R. H. Hardin Dec 06 2011

Status

approved