A154031 Number of planar triangular n X n X n nonnegative integer grids with every similarly oriented 4 X 4 X 4 subtriangle summing to 2.

55, 118, 138, 97, 37, 21, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15

Offset

4,1

Comments

Value 15 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
...........0
..........0.0
.........0.0.1
........0.1.0.0
.......1.0.0.0.0
......0.0.0.0.1.0
.....0.0.0.1.0.0.0
....0.0.1.0.0.0.0.1
...0.1.0.0.0.0.1.0.0
..1.0.0.0.0.1.0.0.0.0

Crossrefs

Sequence in context: A275124 A282768 A217429 * A044242 A044623 A063345

Adjacent sequences: A154028 A154029 A154030 * A154032 A154033 A154034

Keyword

nonn

Author

R. H. Hardin Jan 04 2009

Status

approved