A154034 Number of planar triangular n X n X n nonnegative integer grids with every similarly oriented 3 X 3 X 3 subtriangle summing to 3.

56, 164, 248, 207, 155, 94, 34, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28, 28

Offset

3,1

Comments

Value 28 starts at n=10 and continues through at least n=60.

Links

Table of n, a(n) for n=3..60.

Example

Maximal zeros solution for n=10
...........0
..........0.2
.........1.0.0
........1.0.1.0
.......0.0.1.1.0
......0.2.0.0.0.2
.....1.0.0.1.1.0.0
....1.0.1.0.1.0.1.0
...0.0.1.1.0.0.1.1.0
..0.2.0.0.0.2.0.0.0.2

Crossrefs

Sequence in context: A220008 A044388 A044769 * A225324 A225358 A115620

Adjacent sequences: A154031 A154032 A154033 * A154035 A154036 A154037

Keyword

nonn

Author

R. H. Hardin Jan 04 2009

Status

approved