%I #25 May 11 2020 09:44:27
%S 10,121,1055,3506,10410,21111,43740,74526,124490,190291,288190,403321,
%T 573805,771191,1027550,1331896,1721765,2157301,2712175,3322441,
%U 4067325,4904491,5900185,6975151,8268755,9678566,11297345,13060231,15102955,17263311,19784995
%N The number of vertices inside a pentagon formed by the straight line segments mutually connecting all vertices and all points that divide the sides into n equal parts.
%C See the links in A331929 for images of the pentagons.
%H Lars Blomberg, <a href="/A330847/b330847.txt">Table of n, a(n) for n = 1..35</a>
%Y Cf. A331929 (regions), A331939 (n-gons), A329710 (edges), A330846, A092866, A332599, A007569
%K nonn
%O 1,1
%A _Scott R. Shannon_ and _N. J. A. Sloane_, Mar 07 2020
%E a(9) and beyond from _Lars Blomberg_, May 11 2020