A183291 Number of nXnXnXn triangular pyramidal binary arrays with the number of 0-0 adjacencies equal to the number of 0-1 adjacencies

2, 5, 75, 29721, 331189203

Offset

1,1

Links

Table of n, a(n) for n=1..5.

Example

Some solutions for 3X3X3X3
....0......1......0......0......0......1......0......0......1......0......1
...
....0......1......0......0......1......0......0......1......0......0......0
...0.1....0.0....0.0....0.1....0.0....0.0....0.0....0.0....0.1....0.0....0.0
...
....1......0......1......0......0......1......1......0......0......1......0
...0.1....0.1....1.0....0.0....0.0....0.0....0.0....0.0....0.0....1.1....1.0
..0.0.0..0.0.0..1.0.1..1.1.0..0.1.0..1.0.1..1.1.1..1.0.1..0.1.0..0.0.1..0.0.1

Crossrefs

Sequence in context: A172037 A301993 A128297 * A254405 A216847 A102983

Adjacent sequences: A183288 A183289 A183290 * A183292 A183293 A183294

Keyword

nonn

Author

R. H. Hardin Jan 03 2011

Status

approved