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.

0, 1, 13, 138, 1628, 23527, 435147, 10546164, 339692832, 14675385285, 855707505235, 67645098281722, 7273718690098068, 1066532362363098251, 213665221064800026604, 58573977551568152227368

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