login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A154038 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 4. 0
14, 25, 24, 27, 22, 18, 15, 16, 15, 15, 16, 15, 15, 16, 15, 15, 16, 15, 15, 16, 15, 15, 16, 15, 15, 16, 15, 15, 16, 15, 15, 16, 15, 15, 16, 15, 15, 16, 15, 15, 16, 15, 15, 16, 15, 15, 16, 15, 15, 16, 15, 15, 16, 15, 15, 16, 15, 15 (list; graph; refs; listen; history; text; internal format)
OFFSET
3,1
COMMENTS
Pattern 15 16 15 starts at n=9 and continues through at least n=60.
LINKS
EXAMPLE
Maximal zeros solution for n=9
..........2
.........0.0
........0.2.0
.......2.0.0.2
......0.0.2.0.0
.....0.2.0.0.2.0
....2.0.0.2.0.0.2
...0.0.2.0.0.2.0.0
..0.2.0.0.2.0.0.2.0
CROSSREFS
Sequence in context: A141838 A140499 A068365 * A366960 A061923 A031075
KEYWORD
nonn
AUTHOR
R. H. Hardin Jan 04 2009
STATUS
approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 28 18:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)