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A271240 Number of nXnXn triangular 0..2 arrays with new values introduced in sequential zero-upwards order and exactly one inverted 2x2x2 triangle having values all different. 1
0, 0, 27, 3969, 900963, 401227533, 378139318893, 781827640754454, 3616937252790336657, 37896435473683175186868, 906454150918706470312961064, 49772528444719473909687286111017, 6299004718478220148511987214265415811 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Column 2 of A271246.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..14

EXAMPLE

Some solutions for n=4

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

....1.0......1.1......0.0......1.1......1.0......0.1......1.0......1.2

...0.2.1....1.2.1....0.0.1....1.0.1....2.2.2....1.2.2....2.0.0....2.2.0

..0.2.2.1..2.1.0.1..0.2.2.0..2.2.1.0..1.2.2.2..2.2.2.2..1.1.2.0..0.2.1.2

CROSSREFS

Cf. A271246.

Sequence in context: A195374 A238698 A230169 * A223327 A211927 A298595

Adjacent sequences:  A271237 A271238 A271239 * A271241 A271242 A271243

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 02 2016

STATUS

approved

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Last modified September 27 03:21 EDT 2020. Contains 337380 sequences. (Running on oeis4.)