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

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