A211902 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)/2-5

0, 0, 15, 2605, 336017, 12353030, 212518051, 2254248571, 17095114982

Offset

1,3

Comments

Column 4 of A211904

Links

Table of n, a(n) for n=1..9.

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
...3.0.3....0.3.4....3.4.3....3.4.0....3.4.0....3.4.3....3.4.0....3.4.3
..4.2.5.0..3.1.5.6..5.0.2.5..5.0.5.2..2.0.2.5..2.5.2.5..0.5.3.4..0.2.5.2

Crossrefs

Sequence in context: A266571 A308389 A278410 * A200797 A241116 A126678

Adjacent sequences: A211899 A211900 A211901 * A211903 A211904 A211905

Keyword

nonn

Author

R. H. Hardin Apr 25 2012

Status

approved