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A192500 Half the number of nXnXn triangular binary arrays with every element unequal to at most 4 neighbors 1
1, 4, 32, 456, 11296, 490296, 37306768, 4974819000, 1162617751768, 476177297334976, 341799731787300184, 429977139597378261384, 947959915554749042500496, 3662733300047294688846615504 (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

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

....0.1.1......0.0.0......1.1.0......0.0.1......0.1.1......0.0.1......0.0.1

...0.0.1.0....1.1.1.1....1.1.0.1....1.0.0.1....1.1.1.1....0.0.0.1....1.0.0.0

..0.0.1.0.1..0.0.0.1.1..0.1.0.0.0..0.1.1.1.0..0.1.0.0.0..0.1.0.1.0..0.0.1.1.1

CROSSREFS

Sequence in context: A005121 A327379 A214379 * A192486 A037964 A089285

Adjacent sequences:  A192497 A192498 A192499 * A192501 A192502 A192503

KEYWORD

nonn

AUTHOR

R. H. Hardin Jul 02 2011

STATUS

approved

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Last modified November 29 21:05 EST 2020. Contains 338769 sequences. (Running on oeis4.)