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%I #15 May 03 2020 06:05:10
%S 5,15,35,76,142,251,408,576,947,1367,1845,2600,3460,4011,5822,7386,
%T 9023,11423,13967,16242,20330,24235,28222,33686,39327,44967,52733,
%U 60608,67383,78947,89530,100040,113885,127791,141925,159356,177158,194895,217232,239662
%N The number of edges formed by straight line segments mutually connecting all vertices of a semicircular polygon defined in A333642.
%C See A333642 for a precise definition of the polygon and images.
%H Lars Blomberg, <a href="/A330911/b330911.txt">Table of n, a(n) for n = 1..100</a>
%Y Cf. A333642 (regions), A330913 (vertices), A330914 (n-gons), A333278, A333027, A135565.
%K nonn
%O 1,1
%A _Scott R. Shannon_ and _N. J. A. Sloane_, May 02 2020
%E a(21) and beyond from _Lars Blomberg_, May 03 2020