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A192499 Half the number of nXnXn triangular binary arrays with every element unequal to at most 3 neighbors 0
1, 4, 26, 196, 2092, 28686, 534806, 13182070, 433981798, 19015675154, 1110527815484, 86390598478646, 8953005948663932, 1236137340970342866, 227372493923183802446 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..15.

EXAMPLE

Some solutions for 5X5X5 with a(1,1)=0

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

.....1.1........0.0........1.1........0.0........1.1........0.1........1.0

....1.1.0......1.1.0......1.1.1......1.0.1......0.0.0......1.0.1......1.1.1

...0.0.0.0....1.1.1.0....0.1.1.1....1.0.0.1....0.0.0.1....1.0.0.0....0.0.1.0

..0.0.0.0.1..0.0.1.1.1..0.0.0.0.0..0.0.0.1.0..0.1.1.1.0..1.0.0.0.0..0.0.0.1.0

CROSSREFS

Sequence in context: A127086 A198024 A278393 * A271935 A246509 A253255

Adjacent sequences:  A192496 A192497 A192498 * A192500 A192501 A192502

KEYWORD

nonn

AUTHOR

R. H. Hardin Jul 02 2011

STATUS

approved

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Last modified December 4 09:01 EST 2020. Contains 338921 sequences. (Running on oeis4.)