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 A210690 #12 Oct 12 2017 04:19:43 %S A210690 1,2,6,20,93 %N A210690 Erroneous version of A000421. %D A210690 Cadogan, C. C. Graph-lattices and the enumeration of linear graphs. 1970 Proc. Louisiana Conf. on Combinatorics, Graph Theory and Computing (Louisiana State Univ., Baton Rouge, La., 1970) pp. 61--86 Louisiana State Univ., Baton Rouge, La. MR0269553 (42 #4448). %K A210690 dead %O A210690 1,2 %A A210690 _N. J. A. Sloane_, Mar 30 2012