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 A068326 #22 Jan 04 2021 07:47:05
%S A068326 1,11,1221,13566531,15073921825941,167488020286558453130451,
%T A068326 186097800318379671476024826838541061,
%U A068326 2067753336870885217944964707274937180441685906828771,2297503707634316908597988192875387398496877151223641424395368232574581
%N A068326 a(n) = Product_{k=1..n} A031974(k).
%o A068326 (PARI) a(n) = prod(k=1, n, (10^prime(k) - 1)/9); \\ _Michel Marcus_, Jan 04 2021
%Y A068326 Cf. A031974.
%K A068326 nonn,base
%O A068326 0,2
%A A068326 _Jani Melik_, Feb 27 2002
%E A068326 More terms from _Jason Earls_, May 19 2002