%I #12 Dec 29 2023 14:23:32
%S 1,4,12,39,125,271,609,1076,1884,2950,4642,6541,9607,12969,17505,
%T 23034,30294,37888,48488,59404,73506,88779,108077,127412,153000,
%U 178514,210366,242961,283243,322120,373147,422454,482442,542604,615300,685885,773189,857791
%N Number of vertices in a polygon whose boundary consists of n+2 equally space points around a semicircle and n+2 equally spaced points along the diameter (a total of 2n+2 points). See Comments for precise definition.
%C A semicircular polygon with 2n+2 points is created by placing n+2 equally spaced vertices along the semicircle's arc (including the two end vertices). Also place n+2 equally spaced vertices along the diameter (again including the same two end vertices). Now connect every pair of vertices by a straight line segment. The sequence gives the number of vertices in the resulting figure.
%H Lars Blomberg, <a href="/A334458/b334458.txt">Table of n, a(n) for n = 0..50</a>
%Y Cf. A333519, A334459
%K nonn
%O 0,2
%A _Lars Blomberg_, May 01 2020
