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%I #31 Jul 08 2016 00:17:08
%S 1,2,6,47
%N a(n) = number of arrangements of n circles in the affine plane in which all circles share part of their boundary with the boundary of the union of all the circles.
%C Consider the arrangements of n circles described in A250001.
%Y Leading diagonal of triangle A249752.
%Y Cf. A250001.
%K nonn,hard,more
%O 1,2
%A _Omar E. Pol_, Jul 06 2016
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