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A201958
T(n,k)=Number of zero-sum nXk -3..3 arrays with every element unequal to at most two horizontal and vertical neighbors
4
1, 7, 7, 37, 231, 37, 231, 1587, 1587, 231, 1451, 17903, 17091, 17903, 1451, 9331, 194633, 303955, 303955, 194633, 9331, 60691, 2232183, 4735345, 9654533, 4735345, 2232183, 60691, 398567, 25952953, 85454789, 300895245, 300895245, 85454789
OFFSET
1,2
COMMENTS
Table starts
......1........7.......37.......231......1451........9331......60691....398567
......7......231.....1587.....17903....194633.....2232183...25952953.305979795
.....37.....1587....17091....303955...4735345....85454789.1489376611
....231....17903...303955...9654533.300895245.10356370455
...1451...194633..4735345.300895245
...9331..2232183.85454789
..60691.25952953
.398567
LINKS
EXAMPLE
Some solutions for n=3 k=3
..0.-3..1....1.-3..3....1..1..0....0..1..1...-2..1..3....2..3..3...-3..1..0
.-3.-3..3...-3.-3.-3...-1.-1.-1....0..1..1...-2..1..3....0..0..0...-3..1..1
..1..1..3....3..3..2....2.-1..0...-3..1.-2...-3..1.-2...-2.-3.-3....0..0..3
CROSSREFS
Column 1 is A025012
Sequence in context: A372230 A154702 A112685 * A351477 A153721 A286985
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin Dec 06 2011
STATUS
approved