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 A098639 #13 Jan 13 2021 01:21:11 %S A098639 1,1,6,69,1230,30663,1005692,41571127,2099861244,126607647073, %T A098639 8945129371976,729628409684925,67868881258920424,7125522244948969319, %U A098639 837004398237510194704,109173596976047915341823,15708090522743045757716496,2478722722731315203268137729 %N A098639 Consider the family of directed multigraphs enriched by the species of odd sets. Sequence gives number of those multigraphs with n labeled arcs. %D A098639 G. Paquin, Dénombrement de multigraphes enrichis, Mémoire, Math. Dept., Univ. Québec à Montréal, 2004. %H A098639 Andrew Howroyd, <a href="/A098639/b098639.txt">Table of n, a(n) for n = 0..200</a> %H A098639 G. Paquin, <a href="/A038205/a038205.pdf">Dénombrement de multigraphes enrichis</a>, Mémoire, Math. Dept., Univ. Québec à Montréal, 2004. [Cached copy, with permission] %F A098639 E.g.f.: B(sinh(x)) where B(x) is the e.g.f. of A014505. - _Andrew Howroyd_, Jan 12 2021 %o A098639 (PARI) \\ EnrichedGdSeq defined in A098623. %o A098639 EnrichedGdSeq(sinh(x + O(x*x^20))) \\ _Andrew Howroyd_, Jan 12 2021 %Y A098639 Cf. A014505, A098623, A098636, A098637, A098638. %K A098639 nonn %O A098639 0,3 %A A098639 _N. J. A. Sloane_, Oct 26 2004 %E A098639 Terms a(12) and beyond from _Andrew Howroyd_, Jan 12 2021