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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
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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
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Last modified May 17 08:10 EDT 2024. Contains 372579 sequences. (Running on oeis4.)