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

1,2

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).

Sequence in context: A223212 A297027 A027566 * A041620 A375329 A244879

Adjacent sequences: A335778 A335779 A335780 * A335782 A335783 A335784

Keyword

nonn

Author

Lars Blomberg, Jun 24 2020

Status

approved