A154048 Number of planar triangular n X n X n nonnegative integer grids symmetric both under 120 degree rotation and reflection with every similarly oriented 4 X 4 X 4 subtriangle summing to 5.

2, 6, 3, 5, 1, 6, 1, 4, 1, 2, 1, 4, 1, 2, 1, 4, 1, 2, 1, 4, 1, 2, 1, 4, 1, 2, 1, 4, 1, 2, 1, 4, 1, 2, 1, 4, 1, 2, 1, 4, 1, 2, 1, 4, 1, 2, 1, 4, 1, 2, 1, 4, 1, 2, 1, 4, 1

Offset

4,1

Comments

Pattern 1 4 1 2 starts at n=10 and continues through at least n=60.

Links

Table of n, a(n) for n=4..60.

Example

Maximal zeros solution for n=10
...........1
..........1.1
.........0.0.0
........0.1.1.0
.......1.0.1.0.1
......1.1.0.0.1.1
.....0.0.0.2.0.0.0
....0.1.1.0.0.1.1.0
...1.0.1.0.1.0.1.0.1
..1.1.0.0.1.1.0.0.1.1

Crossrefs

Sequence in context: A282061 A258252 A351496 * A259018 A353649 A084355

Adjacent sequences: A154045 A154046 A154047 * A154049 A154050 A154051

Keyword

nonn

Author

R. H. Hardin Jan 04 2009

Status

approved