A154042 Number of planar triangular n X n X n nonnegative integer grids with every similarly oriented 4 X 4 X 4 subtriangle summing to 4.

715, 3278, 7090, 8188, 5593, 4377, 1618, 601, 228, 220, 220, 220, 220, 220, 220, 220, 220, 220, 220, 220, 220, 220, 220, 220, 220, 220, 220, 220, 220, 220, 220, 220, 220, 220, 220, 220, 220, 220, 220, 220, 220, 220, 220, 220, 220, 220, 220, 220, 220, 220, 220, 220

Offset

4,1

Comments

Value 220 starts at n=13 and continues through at least n=60.

Links

Table of n, a(n) for n=4..55.

Example

Maximal zeros solution for n=13
..............0
.............0.0
............0.0.2
...........0.2.0.0
..........2.0.0.0.0
.........0.0.0.0.2.0
........0.0.0.2.0.0.0
.......0.0.2.0.0.0.0.2
......0.2.0.0.0.0.2.0.0
.....2.0.0.0.0.2.0.0.0.0
....0.0.0.0.2.0.0.0.0.2.0
...0.0.0.2.0.0.0.0.2.0.0.0
..0.0.2.0.0.0.0.2.0.0.0.0.2

Crossrefs

Sequence in context: A214186 A255788 A029565 * A027809 A222912 A266107

Adjacent sequences: A154039 A154040 A154041 * A154043 A154044 A154045

Keyword

nonn

Author

R. H. Hardin Jan 04 2009

Status

approved