login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A154031 Number of planar triangular n X n X n nonnegative integer grids with every similarly oriented 4 X 4 X 4 subtriangle summing to 2. 0
55, 118, 138, 97, 37, 21, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15 (list; graph; refs; listen; history; text; internal format)
OFFSET

4,1

COMMENTS

Value 15 starts at n=10 and continues through at least n=60.

LINKS

Table of n, a(n) for n=4..60.

EXAMPLE

Maximal zeros solution for n=10

...........0

..........0.0

.........0.0.1

........0.1.0.0

.......1.0.0.0.0

......0.0.0.0.1.0

.....0.0.0.1.0.0.0

....0.0.1.0.0.0.0.1

...0.1.0.0.0.0.1.0.0

..1.0.0.0.0.1.0.0.0.0

CROSSREFS

Sequence in context: A275124 A282768 A217429 * A044242 A044623 A063345

Adjacent sequences:  A154028 A154029 A154030 * A154032 A154033 A154034

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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified June 18 20:45 EDT 2021. Contains 345121 sequences. (Running on oeis4.)