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A217749 Number of triangular regions in the exterior of a regular n-gon with all diagonals drawn. 1
0, 0, 0, 0, 7, 24, 45, 70, 121, 180, 273, 406, 555, 784, 1071 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,5

LINKS

Table of n, a(n) for n=3..17.

CROSSREFS

Cf. A062361, A217746.

Sequence in context: A031084 A063136 A031306 * A006707 A196116 A168668

Adjacent sequences:  A217746 A217747 A217748 * A217750 A217751 A217752

KEYWORD

nonn

AUTHOR

Martin Renner, Mar 23 2013

STATUS

approved

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Last modified January 17 18:14 EST 2020. Contains 330987 sequences. (Running on oeis4.)