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 A054934 #17 Sep 01 2019 04:00:48
%S A054934 1,2,6,30,342,11164,1077370,287640989,207974848520,408004023529326,
%T A054934 2187203136795598146,32269918474347692838600,
%U A054934 1318898367787065334889143452,150182948079490899321955309512894,47886343174490577986560743878301096450,42944209124580582731273744197913175367709988
%N A054934 Number of oriented graphs on n nodes up to reversing the arcs.
%H A054934 Andrew Howroyd, <a href="/A054934/b054934.txt">Table of n, a(n) for n = 1..50</a>
%H A054934 V. A. Liskovets, <a href="http://www.cs.uwaterloo.ca/journals/JIS/VOL3/LISK/Derseq.html">Some easily derivable sequences</a>, J. Integer Sequences, 3 (2000), #00.2.2.
%F A054934 Average of A001174 and A005639.
%t A054934 A001174 = Cases[Import["https://oeis.org/A001174/b001174.txt", "Table"], {_, _}][[All, 2]];
%t A054934 A005639 = Cases[Import["https://oeis.org/A005639/b005639.txt", "Table"], {_, _}][[All, 2]];
%t A054934 a[n_] := (A001174[[n]] + A005639[[n]])/2;
%t A054934 Array[a, 50] (* _Jean-François Alcover_, Sep 01 2019 *)
%Y A054934 Cf. A001174, A005639.
%K A054934 nonn,easy
%O A054934 1,2
%A A054934 _N. J. A. Sloane_, May 24 2000
%E A054934 More terms from Philip Sung (phil(AT)main.nu), May 07 2001
%E A054934 Terms a(15) and beyond from _Andrew Howroyd_, Sep 16 2018