A211903 Number of triangular nXnXn arrays colored with integers 0 upwards introduced in row major order, with no element equal to any neighbor, and containing the value n(n+1)/2-6

0, 0, 15, 3341, 1822850, 210401656, 8415359939, 174254333738

Offset

1,3

Comments

Column 5 of A211904

Links

Table of n, a(n) for n=1..8.

Example

Some solutions for n=4
.....0........0........0........0........0........0........0........0
....1.2......1.2......1.2......1.2......1.2......1.2......1.2......1.2
...3.4.1....3.4.5....2.3.4....3.4.1....3.4.3....0.3.4....2.3.4....3.4.0
..0.2.0.3..2.6.0.6..1.5.2.5..0.5.2.4..0.1.5.0..4.1.5.2..3.5.2.1..0.5.3.5

Crossrefs

Sequence in context: A208579 A080691 A208584 * A278630 A161584 A013720

Adjacent sequences: A211900 A211901 A211902 * A211904 A211905 A211906

Keyword

nonn

Author

R. H. Hardin Apr 25 2012

Status

approved