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 A002719 M3029 N1228 #16 Apr 18 2025 05:46:09 %S A002719 1,3,16,139,1750,29388,623909 %N A002719 Erroneous version of A020554. %D A002719 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence). %D A002719 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %H A002719 L. Comtet, <a href="/A002718/a002718.pdf">Birecouvrements et birevêtements d'un ensemble fini</a>, Studia Sci. Math. Hungar 3 (1968): 137-152. [Annotated scanned copy. Warning: the table of v(n,k) has errors.] %K A002719 dead %O A002719 1,2 %A A002719 _N. J. A. Sloane_, Oct 20 2015