login
The OEIS is supported by
the many generous donors to the OEIS Foundation
.
Hints
(Greetings from
The On-Line Encyclopedia of Integer Sequences
!)
A037984
Maximum number of trapezoids that can be formed by n lines in plane.
0
1, 5, 15, 31, 60, 108, 171, 264, 396, 556, 770, 1050, 1375, 1785, 2295, 2880, 3600, 4425, 5395
(
list
;
graph
;
refs
;
listen
;
history
;
text
;
internal format
)
OFFSET
4,2
LINKS
Table of n, a(n) for n=4..22.
CROSSREFS
Sequence in context:
A056108
A055831
A346823
*
A298032
A073361
A155013
Adjacent sequences:
A037981
A037982
A037983
*
A037985
A037986
A037987
KEYWORD
nonn
AUTHOR
Erich Friedman
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 22:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)