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%I #9 Apr 02 2021 21:19:00
%S 2,2,6,2,2,2,6,6,6,2,2,2,10,2,6,2,2,6,6,6,6,2,6,2,2,6,6,6,2,2,6,2,18,
%T 2,2,2,6,10,2,2,2,2,18,6,6,6,2,6,6,2,6,2,6,2,6,6,6,6,6,6,2,6,14,2,2,2,
%U 2,6,6,2,2,6,18,2,6,2,6,6,6,6,2,2,6,2,10,2,6,10,2,2,6,6,18,6,2,2,6,18
%N Number of lattice points on circumference of a circle of radius (2n+1)/2 with center at (1/2,0).
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/CircleLatticePoints.html">Circle Lattice Points.</a>
%F a(n) = 4 * A046080(2*n+1) + 2. - _Sean A. Irvine_, Apr 02 2021
%Y Cf. A046109.
%K nonn
%O 0,1
%A _Eric W. Weisstein_