A211901 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)/2-4

0, 0, 15, 1198, 36845, 481826, 3783481, 21275955, 94456783, 351372295, 1138865701, 3304768611, 8756290720

Offset

1,3

Comments

Column 3 of A211904

Links

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

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
...3.4.5....2.3.0....3.4.5....3.4.5....3.4.5....3.4.1....3.4.0....3.4.1
..5.6.0.3..4.0.5.6..0.2.6.0..6.2.7.2..6.1.3.1..0.1.5.6..1.5.3.6..5.2.5.6

Crossrefs

Sequence in context: A027492 A001728 A326219 * A059383 A206394 A354385

Adjacent sequences: A211898 A211899 A211900 * A211902 A211903 A211904

Keyword

nonn

Author

R. H. Hardin Apr 25 2012

Status

approved