A192443 - OEIS

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A192443

Number of nXnXn triangular binary arrays with every 1 adjacent to exactly 3 other 1s

1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 4, 13, 35, 87, 286, 908, 4080, 23994, 186034, 1891698

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,10

LINKS

Table of n, a(n) for n=1..20.

EXAMPLE

Some solutions for 12X12X12

.............0........................0........................0

............0.0......................0.0......................0.0

...........0.0.0....................0.0.0....................0.0.0

..........1.1.1.1..................1.1.1.1..................0.0.0.0

.........1.1.0.1.1................1.1.0.1.1................0.0.0.0.0

........1.0.0.0.0.1..............1.0.0.0.0.1..............0.1.1.1.1.0

.......1.1.1.1.0.1.1............1.1.0.0.0.1.1............0.1.1.0.1.1.0

......1.0.0.1.1.0.1.0..........1.0.1.1.0.0.1.0..........0.1.0.0.0.0.1.0

.....1.1.0.0.0.1.1.0.0........1.1.0.1.1.1.1.0.0........0.1.1.0.0.0.1.1.0

....0.1.0.0.0.0.1.0.0.0......0.1.0.0.0.0.1.0.0.0......0.0.1.0.0.0.0.1.0.0

...0.0.1.1.0.1.1.0.0.0.0....0.0.1.1.0.1.1.0.0.0.0....0.0.0.1.1.0.1.1.0.0.0

..0.0.0.1.1.1.1.0.0.0.0.0..0.0.0.1.1.1.1.0.0.0.0.0..0.0.0.0.1.1.1.1.0.0.0.0

CROSSREFS

Sequence in context: A148233 A148234 A284335 * A189590 A189597 A148235

Adjacent sequences: A192440 A192441 A192442 * A192444 A192445 A192446

KEYWORD

nonn

AUTHOR

R. H. Hardin Jul 01 2011

STATUS

approved