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A183290 Half the number of nXnXnXn triangular pyramidal binary arrays with the number of 0-0 adjacencies equal to the number of 1-1 adjacencies 1
1, 3, 75, 43857, 960006269, 1466084347024748, 302925464053912372874616, 16658979732689967888192414390784353, 482781472857798712221209645418994183476323697006 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..18

EXAMPLE

Some solutions for 3X3X3X3 with a(1,1,1)=0

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

...

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

...0.0....0.0....0.0....0.1....0.1....0.1....0.1....0.1....0.1....0.1....0.1

...

....0......1......1......0......1......1......0......1......1......0......1

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

..1.1.1..0.1.1..1.1.0..1.1.1..0.1.1..1.1.0..1.1.1..0.1.1..1.1.0..1.0.1..0.0.1

CROSSREFS

Sequence in context: A195263 A034940 A300924 * A336062 A320306 A238000

Adjacent sequences:  A183287 A183288 A183289 * A183291 A183292 A183293

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 03 2011

STATUS

approved

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Last modified September 24 16:48 EDT 2021. Contains 347651 sequences. (Running on oeis4.)