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 A002141 M3745 N1530 #20 Oct 14 2023 23:44:12 %S A002141 1,1,5,6,7,7,9,53,60,66,83,83,136,136,185,185,185,312,312,312,3064, %T A002141 3718,3718,3718,8096,9826,12384,16602,16602,16602,16760,16760,182424, %U A002141 323392,323392,323392,323392 %N A002141 Class numbers of quadratic fields. %D A002141 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence). %D A002141 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %H A002141 D. H. Lehmer, E. Lehmer and D. Shanks, <a href="https://doi.org/10.1090/S0025-5718-1970-0271006-X">Integer sequences having prescribed quadratic character</a>, Math. Comp., 24 (1970), 433-451. %H A002141 D. H. Lehmer, E. Lehmer and D. Shanks, <a href="/A002189/a002189.pdf">Integer sequences having prescribed quadratic character</a>, Math. Comp., 24 (1970), 433-451. [Annotated scanned copy] %H A002141 <a href="/index/Qua#quadfield">Index entries for sequences related to quadratic fields</a> %K A002141 nonn %O A002141 3,3 %A A002141 _N. J. A. Sloane_