This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A320490 #14 Jan 28 2020 14:56:25 %S A320490 1,2,0,4,16,98,766,9982,205574,6546960,352380815,29668304472, %T A320490 4303531875334,985391751078694,391866509413730125, %U A320490 248491878411568471280,274544424465173973822126,488310442484985365942048784,1513516279388226700191978571979 %N A320490 Inverse Euler transform of A004106. %C A320490 The inverse Euler transform of A004106 does not give the number of connected edge-self-dual nets. The combinatorial interpretation of this sequence is that of either a connected edge-self-dual net or a pair of distinct connected nets which are edge-dual to each other (but not edge-self-dual). - _Andrew Howroyd_, Jan 28 2020 %H A320490 Andrew Howroyd, <a href="/A320490/b320490.txt">Table of n, a(n) for n = 0..50</a> %H A320490 N. J. A. Sloane, <a href="/transforms.txt">Transforms</a> %F A320490 EULERi transform of A004106. %Y A320490 Cf. A004106, A320491. %K A320490 nonn %O A320490 0,2 %A A320490 _N. J. A. Sloane_, Oct 25 2018 %E A320490 Definition edited by _Andrew Howroyd_, Jan 26 2020