A271070 Number of nXnXn triangular 0..2 arrays with new values introduced in sequential zero-upwards order and exactly one 2x2x2 triangle having values all equal.

0, 1, 31, 3192, 688912, 336562064, 385875000312, 1059450143900688, 7053540830611404456, 114825973523109367880880, 4597293982413168923370961064, 454594551827670845887783486952736

Offset

1,3

Comments

Column 2 of A271075.

Links

R. H. Hardin, Table of n, a(n) for n = 1..13

Example

Some solutions for n=4
.....0........0........0........0........0........0........0........0
....0.0......1.0......1.2......1.0......1.0......1.2......1.1......1.0
...0.1.2....1.1.0....1.1.0....0.1.2....0.0.1....1.0.1....0.2.0....0.2.1
..1.0.0.2..0.2.1.1..0.2.2.2..0.0.0.2..2.0.1.0..1.1.2.2..2.2.2.0..0.2.2.0

Crossrefs

Cf. A271075.

Sequence in context: A217913 A174584 A276111 * A262926 A330398 A218661

Adjacent sequences: A271067 A271068 A271069 * A271071 A271072 A271073

Keyword

nonn

Author

R. H. Hardin, Mar 29 2016

Status

approved