The OEIS mourns the passing of
Jim Simons
and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A153933
Number of planar n X n X n binary triangular grids with mirror symmetry about one altitude with no more than 4 ones in any 4 X 4 X 4 subtriangle.
0
1, 2, 4, 13, 26, 135, 581, 5081, 33999, 455470, 5028919, 110445068, 1936072745, 69174531647, 1977766145879, 114385090415133, 5299105178883837, 494911099658091565, 37117101455488584937
(
list
;
graph
;
refs
;
listen
;
history
;
text
;
internal format
)
OFFSET
0,2
LINKS
Table of n, a(n) for n=0..18.
CROSSREFS
Sequence in context:
A189583
A153936
A027301
*
A128601
A034500
A261455
Adjacent sequences:
A153930
A153931
A153932
*
A153934
A153935
A153936
KEYWORD
nonn
AUTHOR
R. H. Hardin
, Jan 03 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 June 5 18:30 EDT 2024. Contains 373107 sequences. (Running on oeis4.)