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%I #12 Mar 15 2021 04:58:03
%S 1,2,4,8,16,36,80,194,506,1400,4024,11870,35200,104836,311686,929088,
%T 2776618,8321128,24967712,74985708
%N a(n) is the number of distinct resistances that can be produced using at most n unit resistors in a planar network.
%C The relation of this sequence to A340920 is the analog of the relation of A180414 to A337517.
%F a(n) = A180414(n) for n <= 9, a(n) < A180414(n) for n >= 10.
%Y Cf. A153588, A174284, A174286, A180414, A337517, A340920.
%K nonn,more,hard
%O 0,2
%A _Hugo Pfoertner_ and _Rainer Rosenthal_, Feb 14 2021
%E a(19) from _Hugo Pfoertner_, Mar 15 2021