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 A160446 #19 Mar 15 2020 07:34:48 %S A160446 1,16,251,14491,1730861,373486525,128038522439,65551419139302, %T A160446 47785761199635528,47785253957386480534,63601854214623350663136, %U A160446 109903723926415382728069729,241458148813601665905147070195 %N A160446 Number of isomorphism classes of n-fold coverings of a connected graph with Betti number 4. %C A160446 Number of orbits of the conjugacy action of Sym(n) on Sym(n)^4 [Kwak and Lee, 2001]. - _Álvar Ibeas_, Mar 24 2015 %D A160446 J. H. Kwak and J. Lee, Enumeration of graph coverings, surface branched coverings and related group theory, in Combinatorial and Computational Mathematics (Pohang, 2000), ed. S. Hong et al., World Scientific, Singapore 2001, pp. 97-161. %H A160446 Álvar Ibeas, <a href="/A160446/b160446.txt">Table of n, a(n) for n = 1..60</a> %H A160446 J. H. Kwak and J. Lee, <a href="https://doi.org/10.4153/CJM-1990-039-3">Isomorphism classes of graph bundles</a>. Can. J. Math., 42(4), 1990, pp. 747-761. %o A160446 (Sage) [sum(p.aut()**3 for p in Partitions(n)) for n in range(1,9)] # _Álvar Ibeas_, Mar 24 2015 %Y A160446 Fifth column of A160449. %K A160446 nonn %O A160446 1,2 %A A160446 _N. J. A. Sloane_, Nov 12 2009 %E A160446 Name clarified and more terms added by _Álvar Ibeas_, Mar 24 2015