A335192 - OEIS

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A335192

a(n) is the number of regions inside an n-gon formed by the straight line segments connecting vertex k to vertex 3k mod n.

1, 2, 4, 7, 8, 6, 12, 19, 23, 18, 31, 39, 37, 28, 56, 57, 68, 60, 76, 93, 103, 72, 119, 133, 129, 126, 164, 163, 184, 146, 196, 223, 239, 206, 263, 283, 277, 240, 328, 317, 356, 336, 372, 409, 431, 348, 463, 489, 481, 474, 548, 543, 584, 510, 604, 651, 679

(list; graph; refs; listen; history; text; internal format)

OFFSET

3,2

COMMENTS

The envelope of the lines form a nephroid.

LINKS

Lars Blomberg, Table of n, a(n) for n = 3..300

Lars Blomberg, Illustration for n = 10

Lars Blomberg, Illustration for n = 20

Lars Blomberg, Illustration for n = 40

Lars Blomberg, Illustration for n = 200

CROSSREFS