A183280 Half the number of nXnXn triangular binary arrays with no element having four consecutive neighbors taken clockwise with equal values

1, 4, 22, 134, 868, 6052, 46848, 415306, 4322824, 53913412, 818822848, 15278575800, 351372976224, 9962126955988, 348066786734314, 14985977146717232, 795230927064186056, 52013690674597756472, 4193062390412799383812

Offset

1,2

Links

Table of n, a(n) for n=1..19.

Example

Some solutions for 6X6X6 with a(1,1)=0
.......0............0............0............0............0............0
......1.0..........0.0..........1.1..........1.0..........1.1..........0.1
.....0.1.1........1.1.1........1.0.0........1.0.1........0.0.1........0.1.1
....1.0.0.1......0.0.0.1......0.0.0.1......1.0.1.0......1.0.0.0......1.0.1.0
...0.1.0.0.0....1.1.0.0.1....0.0.1.1.1....0.1.0.1.0....1.1.1.1.1....1.1.0.1.0
..0.0.1.1.1.0..0.0.1.1.0.1..0.1.1.1.0.0..0.1.1.0.1.0..0.1.0.0.0.1..0.1.0.1.1.0

Crossrefs

Sequence in context: A321275 A274745 A197657 * A183281 A067120 A143648

Adjacent sequences: A183277 A183278 A183279 * A183281 A183282 A183283

Keyword

nonn

Author

R. H. Hardin Jan 03 2011

Status

approved