A192411 Number of nXnXn triangular binary arrays with every 1 adjacent to at most 2 other 1s

2, 8, 48, 537, 10457, 350996, 20588719, 2097220139, 371447058811, 114409134039376, 61266947593618202, 57047805341101073322, 92361175252476980554309, 260002156555728478882116533

Offset

1,1

Links

R. H. Hardin, Table of n, a(n) for n = 1..17

Example

Some solutions for 5X5X5
......1..........0..........1..........1..........0..........0..........1
.....1.0........0.1........0.1........0.0........0.1........0.0........0.1
....1.0.0......0.1.0......0.0.1......0.0.1......0.0.1......0.0.0......0.1.0
...0.0.1.0....0.0.0.0....0.0.0.1....0.1.1.0....1.0.0.0....0.0.1.0....0.0.0.1
..0.0.0.0.1..0.1.1.1.1..1.1.0.0.1..0.1.0.0.0..0.0.1.0.1..0.1.0.0.1..0.0.1.0.0

Crossrefs

Sequence in context: A238805 A005867 A280133 * A179563 A079802 A009741

Adjacent sequences: A192408 A192409 A192410 * A192412 A192413 A192414

Keyword

nonn

Author

R. H. Hardin Jun 30 2011

Status

approved