A183290 Half the number of nXnXnXn triangular pyramidal binary arrays with the number of 0-0 adjacencies equal to the number of 1-1 adjacencies

1, 3, 75, 43857, 960006269, 1466084347024748, 302925464053912372874616, 16658979732689967888192414390784353, 482781472857798712221209645418994183476323697006

Offset

1,2

Links

R. H. Hardin, Table of n, a(n) for n = 1..18

Example

Some solutions for 3X3X3X3 with a(1,1,1)=0
....0......0......0......0......0......0......0......0......0......0......0
...
....0......0......0......0......0......0......0......0......0......0......0
...0.0....0.0....0.0....0.1....0.1....0.1....0.1....0.1....0.1....0.1....0.1
...
....0......1......1......0......1......1......0......1......1......0......1
...1.1....1.1....1.1....0.1....0.1....0.1....1.0....1.0....1.0....1.1....1.1
..1.1.1..0.1.1..1.1.0..1.1.1..0.1.1..1.1.0..1.1.1..0.1.1..1.1.0..1.0.1..0.0.1

Crossrefs

Sequence in context: A195263 A034940 A300924 * A336062 A320306 A359500

Adjacent sequences: A183287 A183288 A183289 * A183291 A183292 A183293

Keyword

nonn

Author

R. H. Hardin Jan 03 2011

Status

approved