A154044 Number of planar triangular n X n X n nonnegative integer grids with mirror symmetry about one altitude with every similarly oriented 3 X 3 X 3 subtriangle summing to 5.

20, 40, 40, 43, 35, 33, 18, 11, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10

Offset

3,1

Comments

Value 10 starts at n=12 and continues through at least n=60.

Links

Table of n, a(n) for n=3..60.

Example

Maximal zeros solution for n=12
.............0
............0.0
...........1.3.1
..........1.0.0.1
.........1.0.2.0.1
........1.1.1.1.1.1
.......0.2.0.1.0.2.0
......1.0.1.1.1.1.0.1
.....2.1.1.0.2.0.1.1.2
....0.0.1.2.0.0.2.1.0.0
...0.2.1.0.0.3.0.0.1.2.0
..2.1.0.1.2.0.0.2.1.0.1.2

Crossrefs

Sequence in context: A352108 A333234 A040380 * A235289 A296764 A046794

Adjacent sequences: A154041 A154042 A154043 * A154045 A154046 A154047

Keyword

nonn

Author

R. H. Hardin Jan 04 2009

Status

approved