A335781 a(n) is the number of regions formed by n-secting the angles of a nonagon (enneagon).

1, 18, 127, 162, 388, 468, 154, 846, 1288, 1422, 1945, 2106, 2827, 1260, 3700, 3870, 4798, 4950, 5995, 6318, 4879, 7524, 8830, 9108, 10387, 10764, 12331, 8730, 13933, 14454, 16147, 16434, 18325, 18846, 16363, 20718, 23077, 23472, 25516, 26154, 28486, 23274

Offset: 1

Author

Lars Blomberg, Jun 24 2020

Keywords

• nonn

Links

• Lars Blomberg, Table of n, a(n) for n = 1..200
• Lars Blomberg, Illustration for n=3
• Lars Blomberg, Illustration for n=4
• Lars Blomberg, Illustration for n=13
• Lars Blomberg, Illustration for n=14

Crossrefs

Cf. A332421 (n-sected sides, not angles), A335782 (vertices), A335783 (edges), A335784 (ngons).