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A271069 Number of nXnXn triangular 0..1 arrays with new values introduced in sequential zero-upwards order and exactly one 2x2x2 triangle having values all equal. 2
0, 1, 13, 138, 1628, 23527, 435147, 10546164, 339692832, 14675385285, 855707505235, 67645098281722, 7273718690098068, 1066532362363098251, 213665221064800026604, 58573977551568152227368 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Column 1 of A271075.

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

...1.1.1....0.1.1....1.0.0....1.1.1....1.0.0....1.0.1....0.0.0....0.1.0

..1.0.0.1..0.1.0.0..0.1.1.0..1.0.0.0..0.0.1.1..0.0.0.1..1.1.1.1..1.0.1.0

CROSSREFS

Cf. A271075.

Sequence in context: A164967 A090505 A088096 * A023301 A023329 A280745

Adjacent sequences:  A271066 A271067 A271068 * A271070 A271071 A271072

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 29 2016

STATUS

approved

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Last modified October 26 02:14 EDT 2021. Contains 348256 sequences. (Running on oeis4.)