A163880 Number of nXnXn triangular binary arrays with all 1s connected, and all vertexes 1

1, 1, 4, 37, 730, 29864, 2491566, 419695572, 141865760710, 95854674462202

Offset

1,3

Links

Table of n, a(n) for n=1..10.

Example

All solutions for n=3
....1......1......1......1..
...1.1....1.1....1.0....0.1.
..1.0.1..1.1.1..1.1.1..1.1.1

Crossrefs

Sequence in context: A352469 A061683 A084283 * A183509 A220245 A371441

Adjacent sequences: A163877 A163878 A163879 * A163881 A163882 A163883

Keyword

nonn

Author

R. H. Hardin Aug 06 2009

Status

approved