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A163882 Number of nXnXn triangular binary arrays with all 1s connected, no 1 having more than 3 1s adjacent, and a path of 1s from peak vertex to anywhere on the bottom side 0
1, 3, 14, 103, 1301, 28378, 1096680, 75428721, 9231236626 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
EXAMPLE
All solutions for n=3
....1......1......1......1......1......1......1......1......1......1......1..
...1.0....1.1....1.0....1.0....1.0....1.0....1.1....1.1....0.1....0.1....0.1.
..0.1.0..0.1.0..1.1.0..0.1.1..1.1.1..1.0.0..1.0.0..1.0.1..0.1.0..1.1.0..0.1.1
------
....1......1......1..
...0.1....0.1....1.1.
..1.1.1..0.0.1..0.0.1
CROSSREFS
Sequence in context: A004659 A054202 A084420 * A271213 A167017 A051106
KEYWORD
nonn
AUTHOR
R. H. Hardin Aug 06 2009
STATUS
approved

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Last modified May 24 12:09 EDT 2024. Contains 372773 sequences. (Running on oeis4.)