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A163884 Number of nXnXn triangular binary arrays with all 1s connected, no 1 having more than 4 1s adjacent, and a path of 1s from peak vertex to anywhere on the bottom side 0
1, 3, 17, 158, 2798, 95400, 6205642, 775567476, 186046719370 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

EXAMPLE

All solutions for n=3

....1......1......1......1......1......1......1......1......1......1......1..

...1.0....1.1....1.0....1.1....1.0....1.1....1.0....1.1....1.0....1.1....1.1.

..0.1.0..0.1.0..1.1.0..1.1.0..0.1.1..0.1.1..1.1.1..1.1.1..1.0.0..1.0.0..1.0.1

------

....1......1......1......1......1......1..

...0.1....0.1....0.1....0.1....0.1....1.1.

..0.1.0..1.1.0..0.1.1..1.1.1..0.0.1..0.0.1

CROSSREFS

Sequence in context: A001469 A110501 A066211 * A175607 A052143 A069856

Adjacent sequences:  A163881 A163882 A163883 * A163885 A163886 A163887

KEYWORD

nonn

AUTHOR

R. H. Hardin (rhhardin(AT)att.net) Aug 06 2009

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Last modified February 15 09:15 EST 2012. Contains 205753 sequences.