A194015 Number of ways to arrange 12 points on an n X n X n triangular grid so that it balances at its center.

0, 0, 0, 0, 17, 4130, 246498, 6833514, 114889560, 1350364581, 12098859685, 87508246816, 531900780705, 2798253712804, 13029075803653, 54632738218122, 209171316078609, 739462342785714, 2436048010628520, 7535911103201627

Offset

1,5

Comments

Column 12 of A194016.

Links

R. H. Hardin, Table of n, a(n) for n = 1..27

Example

Some solutions for 7 X 7 X 7:
........1..............1..............1..............1..............1
.......0.0............0.1............0.1............1.0............0.1
......1.1.1..........0.1.1..........1.0.0..........0.0.0..........0.0.0
.....0.0.0.0........0.0.0.0........0.0.1.0........1.0.1.0........1.1.0.0
....0.0.1.0.0......1.0.0.0.0......1.0.0.0.1......1.0.1.1.0......0.1.1.0.0
...1.1.0.1.1.0....0.0.1.1.0.1....0.0.0.1.0.1....1.0.0.0.0.0....1.0.1.0.1.0
..0.0.1.1.0.0.1..0.1.1.1.1.0.0..1.1.1.0.0.0.1..0.0.1.0.1.1.1..0.0.0.1.1.0.1

Crossrefs

Sequence in context: A367536 A239165 A329168 * A015058 A015034 A350980

Adjacent sequences: A194012 A194013 A194014 * A194016 A194017 A194018

Keyword

nonn

Author

R. H. Hardin, Aug 11 2011

Status

approved