3,2

The envelope of the lines form a nephroid.

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

Cf. A335193 (edges), A335194 (vertices), A335195 (n-gons).

Sequence in context: A094541 A166928 A237199 * A092577 A182842 A009282

Adjacent sequences: A335189 A335190 A335191 * A335193 A335194 A335195

nonn

Lars Blomberg, May 26 2020

approved