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 A006056 M3615 #28 Oct 29 2017 21:40:19 %S A006056 1,1,4,26,255,3642,75606,2316169,106289210,7321773414,748425136289, %T A006056 111576624613588,23864968806932886,7225895692327786931, %U A006056 3064182503223082011556,1803904252801640389374494,1463405916763710662849541695,1625522872429294851288338156654 %N A006056 Number of topologies on n labeled points satisfying the T_4 axiom. %D A006056 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %H A006056 Herman Jamke, <a href="/A006056/b006056.txt">Table of n, a(n) for n = 0..19</a> %H A006056 M. Erné, <a href="http://dx.doi.org/10.1007/BF01173716">Struktur- und Anzahlformeln für Topologien auf Endlichen Mengen</a>, Manuscripta Math., 11 (1974), 221-259. %H A006056 M. Erné, <a href="/A006056/a006056.pdf">Struktur- und Anzahlformeln für Topologien auf Endlichen Mengen</a>, Manuscripta Math., 11 (1974), 221-259. (Annotated scanned copy) %F A006056 E.g.f.: A4(X) = exp(Z4(X)-1) where Z4(x) denotes the e.g.f. for A006058. - Herman Jamke, Mar 02 2008 %Y A006056 Sequences in the Erné (1974) paper: A000798, A001035, A006056, A006057, A001929, A001927, A006058, A006059, A000110. %K A006056 nonn,nice %O A006056 0,3 %A A006056 _N. J. A. Sloane_ %E A006056 More terms from Herman Jamke (hermanjamke(AT)fastmail.fm), Mar 02 2008 %E A006056 More precise definition from _N. J. A. Sloane_, Jan 09 2014