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 A259878 #10 Jun 23 2017 21:13:02 %S A259878 1,2,3,5,10,28,25,37,10,20,15,38,19,42,36,34,2,35,39,31,13,2,6,26,28, %T A259878 29,4,14,42,5,20,17,4,20,16,29,42,13,42,20,8,23,33 %N A259878 Gobel's sequence A003504 read mod 43. %H A259878 R. K. Guy, <a href="http://www.jstor.org/stable/2322249">The strong law of small numbers</a>. Amer. Math. Monthly 95 (1988), no. 8, 697-712. %H A259878 R. K. Guy, <a href="/A005165/a005165.pdf">The strong law of small numbers</a>. Amer. Math. Monthly 95 (1988), no. 8, 697-712. [Annotated scanned copy] %p A259878 t1:=[1,2]; a:=2; %p A259878 for n from 1 to 41 do %p A259878 b:=a*(a+n)/(n+1) mod 43; %p A259878 t1:=[op(t1),b]; a:=b; od: %p A259878 t1; %Y A259878 Cf. A003504 %K A259878 nonn,fini,full %O A259878 0,2 %A A259878 _N. J. A. Sloane_, Jul 10 2015