A154058 Number of planar triangular n X n X n nonnegative integer grids with mirror symmetry about one altitude with every similarly oriented 4 X 4 X 4 subtriangle summing to 6.

77, 419, 263, 565, 252, 422, 79, 74, 15, 21, 11, 11, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8

Offset

4,1

Comments

Value 8 starts at n=16 and continues through at least n=60.

Links

Table of n, a(n) for n=4..60.

Example

Maximal zeros solution for n=16
.................3
................0.0
...............0.3.0
..............0.0.0.0
.............0.0.3.0.0
............3.0.0.0.0.3
...........0.0.0.3.0.0.0
..........0.3.0.0.0.0.3.0
.........0.0.0.0.3.0.0.0.0
........0.0.3.0.0.0.0.3.0.0
.......3.0.0.0.0.3.0.0.0.0.3
......0.0.0.3.0.0.0.0.3.0.0.0
.....0.3.0.0.0.0.3.0.0.0.0.3.0
....0.0.0.0.3.0.0.0.0.3.0.0.0.0
...0.0.3.0.0.0.0.3.0.0.0.0.3.0.0
..3.0.0.0.0.3.0.0.0.0.3.0.0.0.0.3

Crossrefs

Sequence in context: A331976 A020206 A020304 * A027574 A059047 A046149

Adjacent sequences: A154055 A154056 A154057 * A154059 A154060 A154061

Keyword

nonn

Author

R. H. Hardin Jan 04 2009

Status

approved