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%I A281348 #9 May 02 2020 07:34:03
%S A281348 1,2,1,5,2,1,16,8,2,1,53,26,8,2,1,189,100,30,8,2,1,694,375,115,30,8,2,
%T A281348 1,2642,1473,453,120,30,8,2,1,10270,5823,1827,473,120,30,8,2,1,40747,
%U A281348 23479,7432,1936,479,120,30,8,2,1,164033,95618,30622,7954,1961,479,120,30,8,2,1
%N A281348 Triangle read by rows: number of topologies of n nested circles intersecting at most as binaries, according to number of factors.
%H A281348 R. J. Mathar, <a href="http://arxiv.org/abs/1603.00077">Topologically Distinct Sets of Non-intersecting Circles in the Plane</a>, arXiv:1603.00077 [math.CO], 2016.
%e A281348 Triangle begins:
%e A281348 1,
%e A281348 2,1,
%e A281348 5,2,1,
%e A281348 16,8,2,1,
%e A281348 53,26,8,2,1,
%e A281348 189,100,30,8,2,1,
%e A281348 694,375,115,30,8,2,1,
%e A281348 2642,1473,453,120,30,8,2,1,
%e A281348 10270,5823,1827,473,120,30,8,2,1,
%e A281348 ...
%Y A281348 Row sums give A281347.
%K A281348 nonn,tabl
%O A281348 1,2
%A A281348 _N. J. A. Sloane_, Jan 20 2017

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