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A271400 Number of nXnXn triangular 0..1 arrays with new values introduced in sequential zero-upwards order and exactly one inverted 2x2x2 triangle having values all equal. 2
0, 0, 8, 216, 6048, 203256, 8627472, 475098048, 34505348760, 3341298530016, 434656549010376, 76372500634028280, 18198479103071529600, 5898858710813046614376, 2607147775322232410982384 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Column 1 of A271407.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..20

EXAMPLE

Some solutions for n=4

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

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

...0.0.1....0.1.0....0.1.1....0.0.0....0.1.1....1.0.0....0.1.1....1.1.1

..0.0.1.0..0.1.0.1..0.0.1.1..0.1.0.1..0.1.1.0..1.1.0.0..0.0.0.1..1.0.1.0

CROSSREFS

Cf. A271407.

Sequence in context: A069045 A288323 A264056 * A123057 A009072 A002897

Adjacent sequences:  A271397 A271398 A271399 * A271401 A271402 A271403

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 06 2016

STATUS

approved

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Last modified August 1 17:38 EDT 2021. Contains 346402 sequences. (Running on oeis4.)