A154073 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 9.

252, 2298, 1670, 5721, 2507, 7335, 2348, 4388, 1087, 1406, 468, 952, 386, 767, 373, 848, 373, 812, 373, 848, 373, 734, 370, 848, 373, 734, 373, 848, 373, 734, 373, 848, 370, 734, 373, 848, 373, 812, 373, 848, 373, 734, 370, 848, 373, 734, 373, 848, 373, 734, 373

Offset

4,1

Links

Table of n, a(n) for n=4..54.

Example

Maximal zeros solution for n=18
...................1
..................0.0
.................0.4.0
................2.0.0.2
...............0.0.3.0.0
..............2.0.1.1.0.2
.............0.2.0.2.0.2.0
............2.2.0.1.1.0.2.2
...........0.0.1.0.3.0.1.0.0
..........0.0.3.1.0.0.1.3.0.0
.........2.2.0.0.0.4.0.0.0.2.2
........2.0.0.3.1.0.0.1.3.0.0.2
.......0.2.1.0.1.0.3.0.1.0.1.2.0
......0.0.1.1.2.0.1.1.0.2.1.1.0.0
.....0.2.2.0.0.2.0.2.0.2.0.0.2.2.0
....4.0.0.1.1.2.0.1.1.0.2.1.1.0.0.4
...0.0.1.2.1.0.1.0.3.0.1.0.1.2.1.0.0
..0.2.1.1.0.0.3.1.0.0.1.3.0.0.1.1.2.0

Crossrefs

Sequence in context: A154045 A364687 A172223 * A166783 A104679 A117281

Adjacent sequences: A154070 A154071 A154072 * A154074 A154075 A154076

Keyword

nonn

Author

R. H. Hardin Jan 04 2009

Status

approved