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A192331 Half the number of nXnXn triangular binary arrays with no element equal to exactly half of its neighbors 0
0, 1, 4, 12, 57, 567, 7375, 140117, 4140556, 183075048, 11961299512, 1168852060539 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..12.

EXAMPLE

Some solutions for 9x9x9 with a(1,1)=0 and 22 1's

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

.........1.1................0.0................0.0................0.0

........1.1.1..............1.0.0..............0.0.0..............1.0.0

.......1.1.1.1............0.0.0.0............0.1.0.1............1.0.0.0

......0.1.1.1.1..........0.0.0.0.0..........1.1.0.0.0..........1.1.1.1.0

.....0.1.0.1.1.1........1.0.0.0.1.0........1.1.1.1.0.0........0.1.0.0.1.1

....0.0.0.0.1.0.1......1.0.1.0.1.1.1......1.1.1.0.0.0.1......1.0.0.1.1.1.1

...1.0.0.0.0.0.0.0....1.1.0.1.1.1.1.1....1.1.1.1.1.0.0.0....0.0.0.0.1.1.1.0

..0.1.0.0.1.0.0.0.0..1.1.1.1.1.0.0.1.1..1.1.0.1.1.0.1.0.0..0.0.0.1.1.1.1.0.1

CROSSREFS

Sequence in context: A209068 A177265 A243923 * A068525 A067755 A051858

Adjacent sequences:  A192328 A192329 A192330 * A192332 A192333 A192334

KEYWORD

nonn

AUTHOR

R. H. Hardin Jun 28 2011

STATUS

approved

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Last modified May 16 16:06 EDT 2022. Contains 353706 sequences. (Running on oeis4.)