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 A004577 N0412 #14 Sep 09 2017 03:54:17 %S A004577 1,2,4,7,39,202,1219,9468,83435,80017 %N A004577 Erroneous version of A000940. %D A004577 R. C. Read, Some Enumeration Problems in Graph Theory. Ph.D. Dissertation, Department of Mathematics, Univ. London, 1958. %D A004577 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence). %H A004577 R. C. Read, <a href="/A002831/a002831.pdf">Letter to N. J. A. Sloane, Feb 04 1971</a> %H A004577 R. C. Read, <a href="/A002832/a002832.pdf">Letter to N. J. A. Sloane, 1992</a> %K A004577 dead %O A004577 3,2 %A A004577 _N. J. A. Sloane_, Sep 09 2014