

A067154


Number of regions in regular ngon which are heptagons.


10



1, 0, 0, 0, 0, 0, 0, 0, 15, 0, 17, 18, 57, 0, 21, 44, 115, 0, 150, 104, 81, 112, 116, 0, 155, 224, 429, 306, 560, 180, 555, 836, 663, 640, 1025, 378, 1419, 660, 1710, 1564, 1786, 1200, 2352, 1050, 2754, 2236, 2597, 2700, 3410, 2240, 3078, 3190, 4602, 1860, 5551
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OFFSET

7,9


REFERENCES

B. Poonen and M. Rubinstein, Number of Intersection Points Made by the Diagonals of a Regular Polygon, SIAM J. Discrete Mathematics, Vol. 11, pp. 135156.


LINKS

Table of n, a(n) for n=7..61.
Sascha Kurz, mgons in regular ngons
B. Poonen and M. Rubinstein, The number of intersection points made by the diagonals of a regular polygon, SIAM J. on Discrete Mathematics, Vol. 11, No. 1, 135156 (1998).
Sequences formed by drawing all diagonals in regular polygon


EXAMPLE

a(7)=1 because the centerregion is a heptagon.


CROSSREFS

Cf. A007678, A067166, A064869, A067151, A067152, A067153, A067155, A067156, A067157, A067158, A067159.
Sequence in context: A271339 A202857 A055965 * A187486 A141027 A186436
Adjacent sequences: A067151 A067152 A067153 * A067155 A067156 A067157


KEYWORD

easy,nonn


AUTHOR

Sascha Kurz, Jan 06 2002


STATUS

approved



