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A191101 Number of regions in a complete but borderless regular polygon. 0
6, 18, 43, 72, 145, 210, 364, 432, 768, 938, 1441, 1680, 2483, 2448, 4010, 4480, 6154, 6798, 9063, 9000, 12901, 13962, 17848, 19152, 24100, 21450, 31869, 33824, 41383, 43758, 52886, 52920, 66638, 69958, 82915, 86760, 102009 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,1

COMMENTS

A complete borderless polygon is one where each vertex is connected to every other vertex except for adjacent vertices. Adjacent vertices are not connected by edges. The result is a polygon interior.

LINKS

Table of n, a(n) for n=5..41.

FORMULA

a(n) = A007678(n) - n.

CROSSREFS

Cf. A007678.

Sequence in context: A068293 A272250 A272700 * A184630 A009957 A011929

Adjacent sequences:  A191098 A191099 A191100 * A191102 A191103 A191104

KEYWORD

nonn,easy

AUTHOR

Stefan Hannie, May 25 2011

EXTENSIONS

a(8) onward corrected by T. D. Noe, Jun 02 2011

STATUS

approved

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Last modified November 13 23:01 EST 2019. Contains 329106 sequences. (Running on oeis4.)