A037984 - OEIS

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A037984

Maximum number of trapezoids that can be formed by n lines in plane.

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