A154067 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 8.

182, 1408, 988, 2849, 1206, 2855, 879, 1266, 284, 262, 114, 119, 51, 61, 51, 61, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51, 51

Offset

4,1

Comments

Value 51 starts at n=20 and continues through at least n=60.

Links

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

Example

Maximal zeros solution for n=20
.....................4
....................0.0
...................0.4.0
..................0.0.0.0
.................0.0.4.0.0
................4.0.0.0.0.4
...............0.0.0.4.0.0.0
..............0.4.0.0.0.0.4.0
.............0.0.0.0.4.0.0.0.0
............0.0.4.0.0.0.0.4.0.0
...........4.0.0.0.0.4.0.0.0.0.4
..........0.0.0.4.0.0.0.0.4.0.0.0
.........0.4.0.0.0.0.4.0.0.0.0.4.0
........0.0.0.0.4.0.0.0.0.4.0.0.0.0
.......0.0.4.0.0.0.0.4.0.0.0.0.4.0.0
......4.0.0.0.0.4.0.0.0.0.4.0.0.0.0.4
.....0.0.0.4.0.0.0.0.4.0.0.0.0.4.0.0.0
....0.4.0.0.0.0.4.0.0.0.0.4.0.0.0.0.4.0
...0.0.0.0.4.0.0.0.0.4.0.0.0.0.4.0.0.0.0
..0.0.4.0.0.0.0.4.0.0.0.0.4.0.0.0.0.4.0.0

Crossrefs

Sequence in context: A043463 A047636 A157205 * A234982 A234975 A186125

Adjacent sequences: A154064 A154065 A154066 * A154068 A154069 A154070

Keyword

nonn

Author

R. H. Hardin Jan 04 2009

Status

approved