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A192485
Half the number of nXnXn triangular binary arrays with every element equal to at most 3 neighbors
0
1, 4, 28, 312, 5496, 158444, 7386598, 558062828, 68366493762, 13583953615958, 4377011029211530, 2287186005680108048, 1938220889714632813912, 2663689661329760406050654
OFFSET
1,2
EXAMPLE
Some solutions for 6X6X6 with a(1,1)=0
.......0............0............0............0............0............0
......0.0..........0.0..........0.0..........0.1..........0.0..........0.1
.....0.1.0........1.0.1........1.1.1........1.1.1........1.0.1........0.1.1
....1.0.1.1......1.0.1.0......0.1.0.1......0.0.0.0......0.0.1.0......1.0.1.0
...1.1.0.0.1....1.1.0.1.1....1.0.0.1.0....1.0.1.1.0....1.0.1.1.1....0.0.1.0.1
..0.0.1.1.0.0..0.0.0.0.1.0..0.1.1.1.0.0..1.0.1.1.0.1..1.1.1.0.0.1..0.1.1.0.0.0
CROSSREFS
Sequence in context: A177554 A316212 A337592 * A332097 A358072 A198513
KEYWORD
nonn
AUTHOR
R. H. Hardin Jul 02 2011
STATUS
approved