A192412 Number of nXnXn triangular binary arrays with every 1 adjacent to at most 3 other 1s

2, 8, 60, 824, 21280, 1022040, 91643432, 15336064104, 4787874872152, 2789377524761800, 3032271369669763160, 6150768100618440101048, 23280594893804537879907944, 164422151276676325232016120472

Offset

1,1

Links

R. H. Hardin, Table of n, a(n) for n = 1..16

Example

Some solutions for 5X5X5
......0..........0..........0..........0..........1..........1..........0
.....0.1........1.0........0.0........0.0........1.0........0.1........0.0
....0.1.1......1.0.1......1.0.1......0.1.0......0.1.0......1.0.1......0.0.1
...1.0.0.1....1.0.0.0....1.1.0.1....0.0.0.0....1.0.1.1....0.0.0.1....0.0.1.0
..1.0.1.1.1..0.1.1.1.0..0.1.0.1.0..0.1.0.1.1..0.1.0.1.1..0.0.1.1.0..0.0.1.1.0

Crossrefs

Sequence in context: A036794 A096121 A143217 * A191553 A321979 A139017

Adjacent sequences: A192409 A192410 A192411 * A192413 A192414 A192415

Keyword

nonn

Author

R. H. Hardin Jun 30 2011

Status

approved