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A332421 The number of regions inside a nonagon formed by the straight line segments mutually connecting all vertices and all points that divide the sides into n equal parts. 5
154, 2754, 16858, 55098, 142318, 298350, 568162, 975294, 1585666, 2426292, 3588508, 5093604, 7067422, 9523746, 12612214, 16351218, 20924029, 26326026, 32789107, 40289238, 49093282, 59181228, 70852528 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

The terms are from numeric computation - no formula for a(n) is currently known.

LINKS

Table of n, a(n) for n=1..23.

Scott R. Shannon, Nonagon regions for n = 1.

Scott R. Shannon, Nonagon regions for n = 2.

Scott R. Shannon, Nonagon regions for n = 3.

Scott R. Shannon, Nonagon regions with random distance-based coloring for n = 1.

Scott R. Shannon, Nonagon regions with random distance-based coloring for n = 2.

Scott R. Shannon, Nonagon regions with random distance-based coloring for n = 3.

Wikipedia, Nonagon.

CROSSREFS

Cf. A332427 (n-gons), A332428 (vertices), A332429 (edges), A007678, A092867, A331452, A331929.

Sequence in context: A160841 A160853 A235099 * A227977 A282557 A200709

Adjacent sequences:  A332418 A332419 A332420 * A332422 A332423 A332424

KEYWORD

nonn,more

AUTHOR

Scott R. Shannon and N. J. A. Sloane, Mar 09 2020

EXTENSIONS

a(6)-a(23) from Lars Blomberg, May 16 2020

STATUS

approved

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Last modified October 24 20:35 EDT 2021. Contains 348233 sequences. (Running on oeis4.)