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%I #18 Jan 28 2020 03:41:44
%S 1,1,0,1,4,14,65,572,7434,163284,5736792,342169618,33534958026,
%T 5442700283638,1484664947481018,664513607618098252,
%U 508538464299684269212,635542752091150346032474,1374528064543284187245552390,4842758246111267151697826493193,29772724415959420224886585241636839
%N Inverse Euler transform of A004104.
%C The inverse Euler transform of A004104 does not give the number of connected self-dual signed graphs. The combinatorial interpretation of this sequence is that of either a connected self-dual signed graph or a pair of distinct connected signed graphs which are dual to each other (but not self-dual). - _Andrew Howroyd_, Jan 26 2020
%H Andrew Howroyd, <a href="/A320488/b320488.txt">Table of n, a(n) for n = 0..50</a>
%H N. J. A. Sloane, <a href="/transforms.txt">Transforms</a>
%Y Cf. A004102, A004104, A053465, A320499.
%K nonn
%O 0,5
%A _N. J. A. Sloane_, Oct 25 2018
%E Definition edited by _Andrew Howroyd_, Jan 26 2020
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