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A192331 Half the number of nXnXn triangular binary arrays with no element equal to exactly half of its neighbors 0
0, 1, 4, 12, 57, 567, 7375, 140117, 4140556, 183075048, 11961299512, 1168852060539 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,3
LINKS
EXAMPLE
Some solutions for 9x9x9 with a(1,1)=0 and 22 1's
..........0..................0..................0..................0
.........1.1................0.0................0.0................0.0
........1.1.1..............1.0.0..............0.0.0..............1.0.0
.......1.1.1.1............0.0.0.0............0.1.0.1............1.0.0.0
......0.1.1.1.1..........0.0.0.0.0..........1.1.0.0.0..........1.1.1.1.0
.....0.1.0.1.1.1........1.0.0.0.1.0........1.1.1.1.0.0........0.1.0.0.1.1
....0.0.0.0.1.0.1......1.0.1.0.1.1.1......1.1.1.0.0.0.1......1.0.0.1.1.1.1
...1.0.0.0.0.0.0.0....1.1.0.1.1.1.1.1....1.1.1.1.1.0.0.0....0.0.0.0.1.1.1.0
..0.1.0.0.1.0.0.0.0..1.1.1.1.1.0.0.1.1..1.1.0.1.1.0.1.0.0..0.0.0.1.1.1.1.0.1
CROSSREFS
Sequence in context: A209068 A177265 A243923 * A068525 A067755 A051858
KEYWORD
nonn
AUTHOR
R. H. Hardin Jun 28 2011
STATUS
approved

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Last modified May 28 12:54 EDT 2024. Contains 372913 sequences. (Running on oeis4.)