A154071 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 8.

990, 3472, 5217, 7165, 5966, 5372, 3621, 1629, 738, 448, 184, 109, 100, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87, 87

Offset

5,1

Comments

Value 87 starts at n=18 and continues through at least n=52.

Links

Table of n, a(n) for n=5..52.

Example

Maximal zeros solution for n=18
...................0
..................1.1
.................0.3.0
................0.0.0.0
...............0.0.3.0.0
..............1.0.0.0.0.1
.............2.0.0.2.0.0.2
............0.1.0.1.1.0.1.0
...........0.2.0.0.1.0.0.2.0
..........0.0.1.0.1.1.0.1.0.0
.........0.0.2.0.0.1.0.0.2.0.0
........2.0.0.1.0.1.1.0.1.0.0.2
.......1.1.0.1.0.0.2.0.0.1.0.1.1
......0.0.0.1.2.0.0.0.0.2.1.0.0.0
.....0.2.1.0.0.0.0.3.0.0.0.0.1.2.0
....0.0.0.0.1.2.0.0.0.0.2.1.0.0.0.0
...1.0.2.1.0.0.0.0.3.0.0.0.0.1.2.0.1
..1.1.0.0.0.1.2.0.0.0.0.2.1.0.0.0.1.1

Crossrefs

Sequence in context: A341604 A295768 A255917 * A218133 A295433 A068301

Adjacent sequences: A154068 A154069 A154070 * A154072 A154073 A154074

Keyword

nonn

Author

R. H. Hardin Jan 04 2009

Status

approved