A154045 Number of planar triangular n X n X n nonnegative integer grids with every similarly oriented 3 X 3 X 3 subtriangle summing to 5.

252, 1304, 3408, 5277, 7873, 6195, 3852, 2331, 1803, 1728, 1968, 1728, 1728, 1872, 1728, 1728, 1864, 1728, 1728, 1872, 1728, 1728, 1968, 1728, 1728, 1872, 1728, 1728, 1864, 1728, 1728, 1872, 1728, 1728, 1968, 1728, 1728, 1872, 1728, 1728, 1864, 1728

Offset

3,1

Comments

Pattern 1728 1968 1728 1728 1872 1728 1728 1864 1728 1728 1872 1728 starts at n=12 and continues through at least n=55.

Links

Table of n, a(n) for n=3..44.

Example

Maximal zeros solution for n=12
.............0
............0.2
...........3.0.0
..........0.1.1.1
.........0.1.0.2.1
........1.1.2.0.0.1
.......2.1.0.0.3.0.0
......0.0.1.2.0.0.2.2
.....1.1.1.1.0.2.0.1.0
....0.2.1.0.1.1.1.1.0.1
...2.0.0.1.2.0.1.0.2.1.1
..2.0.1.2.0.0.2.1.0.1.1.0

Crossrefs

Sequence in context: A275315 A184505 A184499 * A364687 A172223 A154073

Adjacent sequences: A154042 A154043 A154044 * A154046 A154047 A154048

Keyword

nonn

Author

R. H. Hardin Jan 04 2009

Status

approved