A183281 Half the number of nXnXn triangular binary arrays with equal numbers of elements having four consecutive neighbors taken clockwise with value 1 and with value 0.

1, 4, 22, 134, 2425, 123687, 12282948, 2562040203, 1107329667722, 982402540306648

Offset

1,2

Links

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

Example

Some 5X5X5 solutions with a(1,1)=0
......0..........0..........0..........0..........0..........0..........0
.....1.1........0.0........1.1........1.1........0.0........1.0........1.0
....0.1.1......0.1.1......0.1.0......1.0.1......0.1.1......1.0.1......0.0.0
...1.0.1.0....1.0.1.0....0.1.1.1....0.0.0.0....0.0.0.1....1.0.0.1....1.0.1.1
..1.1.0.0.1..1.0.1.1.1..0.0.0.1.0..0.1.0.1.1..1.1.1.1.0..1.1.0.1.1..1.1.1.0.0

Crossrefs

Sequence in context: A274745 A197657 A183280 * A067120 A143648 A069835

Adjacent sequences: A183278 A183279 A183280 * A183282 A183283 A183284

Keyword

nonn

Author

R. H. Hardin, Jan 03 2011

Status

approved