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A335781 a(n) is the number of regions formed by n-secting the angles of a nonagon (enneagon). 4
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 (list; graph; refs; listen; history; text; internal format)
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 A244879 A142965

Adjacent sequences:  A335778 A335779 A335780 * A335782 A335783 A335784

KEYWORD

nonn

AUTHOR

Lars Blomberg, Jun 24 2020

STATUS

approved

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Last modified July 7 10:17 EDT 2022. Contains 355143 sequences. (Running on oeis4.)