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A192486 Half the number of nXnXn triangular binary arrays with every element equal to at most 4 neighbors 1
1, 4, 32, 456, 12448, 633496, 60579496, 10860561408, 3651968551248, 2303009639295776, 2723749599014985200, 6041414189694017609992, 25131037868379536848766008, 196057055650843201586074483360 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

R. H. Hardin, 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........1.0........0.1........0.1........1.0........0.0

....1.0.0......1.1.1......1.1.0......0.0.1......1.0.1......1.1.0......1.1.0

...1.1.1.0....1.0.1.0....0.1.1.0....1.1.1.1....0.0.1.1....0.1.1.0....1.0.1.0

..0.1.0.0.1..1.1.0.1.0..1.1.0.0.0..0.1.0.1.0..0.0.1.0.0..1.1.0.1.0..0.0.1.1.1

CROSSREFS

Sequence in context: A327379 A214379 A192500 * A037964 A089285 A209197

Adjacent sequences:  A192483 A192484 A192485 * A192487 A192488 A192489

KEYWORD

nonn

AUTHOR

R. H. Hardin Jul 02 2011

STATUS

approved

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Last modified October 20 10:00 EDT 2020. Contains 337900 sequences. (Running on oeis4.)