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 A002631 M1502 N0590 #14 Nov 25 2015 01:51:43 %S A002631 1,2,5,16,67,435 %N A002631 Number of circuits of nullity n. %D A002631 R. M. Foster, Geometrical circuits of electrical networks, Transactions of the American Institute of Electrical Engineers, 51 (1932), 309-317. %D A002631 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence). %D A002631 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %Y A002631 Cf. A002632. %K A002631 nonn,more,nice %O A002631 1,2 %A A002631 _N. J. A. Sloane_