OFFSET
1,4
COMMENTS
a(n)=0 for n mod 4 = 2 or 3 because the number of edges is odd and flipping a 0 to a 1 changes the relative counts by an even number.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..59
EXAMPLE
Some solutions for 4 X 4 X 4 with a(1,1)=0 and an equal number of 0-0 and 1-1 adjacencies:
.....0........0........0........0........0........0........0........0
....1.0......1.0......0.0......1.0......1.1......1.0......0.1......1.1
...1.0.0....1.0.0....1.0.1....1.0.1....0.1.1....0.0.1....1.0.1....0.0.0
..1.1.1.0..0.1.1.1..0.1.1.1..1.1.0.0..0.0.0.0..0.1.1.1..0.1.0.1..1.1.1.0
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 03 2011
STATUS
approved