A217749 Number of triangular regions in the exterior of a regular n-gon with all diagonals drawn.

0, 0, 0, 0, 7, 24, 45, 70, 121, 180, 273, 406, 555, 784, 1071

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