A154061 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 6.

300, 782, 945, 1120, 906, 954, 767, 352, 274, 247, 240, 284, 240, 240, 240, 240, 284, 240, 240, 240, 240, 284, 240, 240, 240, 240, 284, 240, 240, 240, 240, 284, 240, 240, 240, 240, 284, 240, 240, 240, 240, 284, 240, 240, 240, 240, 284, 240, 240, 240, 240, 284, 240

Offset

5,1

Comments

Pattern 240 284 240 240 240 starts at n=15 and continues through at least n=59.

Links

Table of n, a(n) for n=5..57.

Example

Maximal zeros solution for n=15
................2
...............0.0
..............0.2.0
.............0.0.0.0
............0.0.2.0.0
...........2.0.0.0.0.2
..........0.0.0.2.0.0.0
.........0.2.0.0.0.0.2.0
........0.0.0.0.2.0.0.0.0
.......0.0.2.0.0.0.0.2.0.0
......2.0.0.0.0.2.0.0.0.0.2
.....0.0.0.2.0.0.0.0.2.0.0.0
....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
..0.0.2.0.0.0.0.2.0.0.0.0.2.0.0

Crossrefs

Sequence in context: A250008 A332282 A190879 * A253650 A054026 A237773

Adjacent sequences: A154058 A154059 A154060 * A154062 A154063 A154064

Keyword

nonn

Author

R. H. Hardin Jan 04 2009

Status

approved