OFFSET
1,2
COMMENTS
Also the number of maximal independent vertex sets (and minimal vertex covers) in the (n-1)-triangular grid graph. - Eric W. Weisstein, Jun 14 and Aug 07 2017
LINKS
Eric Weisstein's World of Mathematics, Minimal Vertex Cover
Eric Weisstein's World of Mathematics, Maximal Independent Vertex Set
Eric Weisstein's World of Mathematics, Triangular Grid Graph
EXAMPLE
Some solutions for 5 X 5 X 5:
......1..........0..........0..........0..........0..........1..........0
.....1.0........2.2........1.2........2.1........1.2........0.2........2.2
....1.2.2......0.2.0......1.1.0......0.1.1......1.1.0......1.2.0......1.0.1
...0.2.0.2....2.2.2.2....0.2.2.2....2.2.1.0....0.1.2.2....1.1.1.2....1.2.2.1
..1.1.1.2.0..0.2.0.2.0..1.2.0.2.0..1.0.1.1.1..1.1.1.0.1..1.0.1.1.0..0.2.0.2.0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 16 2011
STATUS
approved