A183279 Half the number of nXnXn triangular binary arrays with no array-nonaligned 2X2X2 subtriangle being all zero or all one

1, 4, 24, 216, 2808, 51840, 1347192, 49029624, 2490765552, 176234338656, 17339959771992, 2369745054644616, 449436884224900104, 118209416642307619200, 43093920857777993195064

Offset

1,2

Links

R. H. Hardin, Table of n, a(n) for n = 1..23

Example

Some solutions for 6X6X6 with a(1,1)=0
.......0............0............0............0............0............0
......0.0..........1.0..........0.1..........1.0..........1.0..........0.1
.....0.1.0........1.0.0........1.0.1........1.0.1........0.0.1........1.0.0
....1.0.0.1......1.0.1.0......1.1.1.0......1.0.1.0......1.1.0.0......1.0.1.0
...0.0.1.0.1....1.0.1.0.1....1.0.0.0.1....0.1.1.1.0....0.0.1.1.0....1.0.1.1.0
..1.1.1.1.1.1..1.1.1.1.1.0..1.0.1.1.0.1..1.1.0.0.1.1..0.1.1.0.0.1..0.1.0.0.0.0

Crossrefs

Sequence in context: A077555 A166881 A334602 * A145237 A034256 A179539

Adjacent sequences: A183276 A183277 A183278 * A183280 A183281 A183282

Keyword

nonn

Author

R. H. Hardin Jan 03 2011

Status

approved