A154059 Number of planar triangular n X n X n nonnegative integer grids with every similarly oriented 4 X 4 X 4 subtriangle summing to 6.

5005, 42379, 161481, 327971, 465436, 588412, 315265, 126740, 40993, 9833, 4891, 3523, 2084, 2080, 2080, 2080, 2080, 2080, 2080, 2080, 2080, 2080, 2080, 2080, 2080, 2080, 2080, 2080, 2080, 2080, 2080, 2080, 2080, 2080, 2080, 2080, 2080, 2080, 2080

Offset

4,1

Comments

Value 2080 starts at n=17 and continues through at least n=50.

Links

Table of n, a(n) for n=4..42.

Example

Maximal zeros solution for n=17
..................0
.................0.0
................0.0.3
...............0.3.0.0
..............3.0.0.0.0
.............0.0.0.0.3.0
............0.0.0.3.0.0.0
...........0.0.3.0.0.0.0.3
..........0.3.0.0.0.0.3.0.0
.........3.0.0.0.0.3.0.0.0.0
........0.0.0.0.3.0.0.0.0.3.0
.......0.0.0.3.0.0.0.0.3.0.0.0
......0.0.3.0.0.0.0.3.0.0.0.0.3
.....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
...0.0.0.0.3.0.0.0.0.3.0.0.0.0.3.0
..0.0.0.3.0.0.0.0.3.0.0.0.0.3.0.0.0

Crossrefs

Sequence in context: A280879 A067226 A249081 * A138637 A140921 A295459

Adjacent sequences: A154056 A154057 A154058 * A154060 A154061 A154062

Keyword

nonn

Author

R. H. Hardin Jan 04 2009

Status

approved