A154055 Number of planar triangular n X n X n nonnegative integer grids with mirror symmetry about one altitude with every similarly oriented 3 X 3 X 3 subtriangle summing to 6.

30, 67, 78, 94, 85, 83, 54, 55, 32, 35, 32, 35, 29, 38, 29, 35, 32, 35, 29, 38, 29, 35, 32, 35, 29, 38, 29, 35, 32, 35, 29, 38, 29, 35, 32, 35, 29, 38, 29, 35, 32, 35, 29, 38, 29, 35, 32, 35, 29, 38, 29, 35, 32, 35, 29, 38, 29, 35

Offset

3,1

Comments

Pattern 35 32 35 29 38 29 starts at n=12 and continues through at least n=60.

Links

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

Example

Maximal zeros solution for n=12
.............3
............0.0
...........0.3.0
..........3.0.0.3
.........0.0.3.0.0
........0.3.0.0.3.0
.......3.0.0.3.0.0.3
......0.0.3.0.0.3.0.0
.....0.3.0.0.3.0.0.3.0
....3.0.0.3.0.0.3.0.0.3
...0.0.3.0.0.3.0.0.3.0.0
..0.3.0.0.3.0.0.3.0.0.3.0

Crossrefs

Sequence in context: A157346 A219543 A309393 * A270758 A241192 A359545

Adjacent sequences: A154052 A154053 A154054 * A154056 A154057 A154058

Keyword

nonn

Author

R. H. Hardin Jan 04 2009

Status

approved