A154051 Number of planar triangular n X n X n nonnegative integer grids with mirror symmetry about one altitude with every similarly oriented 5 X 5 X 5 subtriangle summing to 5.

144, 321, 322, 328, 186, 123, 89, 49, 37, 31, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27, 27

Offset

5,1

Comments

Value 27 starts at n=15 and continues through at least n=60.

Links

Table of n, a(n) for n=5..60.

Example

Maximal zeros solution for n=15
................2
...............0.0
..............0.2.0
.............0.0.0.0
............0.0.1.0.0
...........0.0.1.1.0.0
..........2.0.0.0.0.0.2
.........0.0.0.1.1.0.0.0
........0.2.0.0.0.0.0.2.0
.......0.0.0.0.1.1.0.0.0.0
......0.0.1.0.0.1.0.0.1.0.0
.....0.0.1.1.0.0.0.0.1.1.0.0
....2.0.0.0.0.0.2.0.0.0.0.0.2
...0.0.0.1.1.0.0.0.0.1.1.0.0.0
..0.2.0.0.0.0.0.2.0.0.0.0.0.2.0

Crossrefs

Sequence in context: A134341 A125841 A320457 * A335543 A366854 A217584

Adjacent sequences: A154048 A154049 A154050 * A154052 A154053 A154054

Keyword

nonn

Author

R. H. Hardin Jan 04 2009

Status

approved