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A183275 Half the number of nXnXn triangular binary arrays with each element having no more than two neighbors equal to itself 0
1, 4, 16, 67, 277, 1025, 3407, 10265, 28589, 74945, 187583, 453167, 1065257, 2451317, 5546819, 12383627, 27347117, 59851121, 130009223, 280620167, 602424305, 1287187757, 2739013259, 5807246915, 12272861813, 25862365481 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..26.

EXAMPLE

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

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

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

....1.0.1......1.1.0......1.0.0......1.0.1......0.0.1......1.0.1......0.0.0

...0.1.0.1....1.0.0.1....0.1.1.1....1.0.1.0....1.1.0.0....0.0.1.0....0.1.1.0

..1.0.1.1.0..1.0.1.1.0..1.0.0.0.1..0.1.1.0.0..1.0.1.1.0..1.1.1.0.0..1.0.1.0.1

CROSSREFS

Sequence in context: A151242 A218645 A273582 * A024551 A261048 A091153

Adjacent sequences:  A183272 A183273 A183274 * A183276 A183277 A183278

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 03 2011

STATUS

approved

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Last modified June 24 21:50 EDT 2021. Contains 345433 sequences. (Running on oeis4.)