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A271333 Number of nXnXn triangular 0..1 arrays with new values introduced in sequential zero-upwards order and exactly one upright 2x2x2 triangle having values all equal. 2
0, 1, 15, 207, 3283, 64650, 1640007, 54704700, 2429994600, 144950275305, 11678538065077, 1276251983814717, 189767651505152535, 38484504169958401936, 10664509514660169498882, 4044220867954839169651680 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

Column 1 of A271339.

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

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

...0.1.0....1.1.1....1.0.0....1.1.0....1.1.0....1.0.1....1.0.0....0.0.0

..0.0.0.1..0.1.0.1..1.1.1.1..0.0.1.0..1.0.0.0..0.0.0.0..0.0.1.1..0.1.1.1

CROSSREFS

Cf. A271339.

Sequence in context: A194481 A078265 A089138 * A051813 A280160 A239991

Adjacent sequences:  A271330 A271331 A271332 * A271334 A271335 A271336

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 04 2016

STATUS

approved

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Last modified May 17 10:16 EDT 2022. Contains 353745 sequences. (Running on oeis4.)