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 A306848 #55 Dec 10 2023 18:07:45
%S A306848 1,9,135,2835,70875,1913625,63149625,2210236875,86199238125,
%T A306848 3878965715625,190069320065625,9693535323346875,533144442784078125,
%U A306848 30389233238692453125,1914521694037624546875,124443910112445595546875,8586629797758746092734375
%N A306848 Product of first n odd nonprimes, a(n) = Product_{k=1..n} A071904(k).
%t A306848 With[{nn = 70}, FoldList[Times, Complement[Range[1, nn, 2], Prime@ Range[2, PrimePi@ nn]]]] (* _Michael De Vlieger_, Apr 21 2019 *)
%o A306848 (PARI) lista(nn) = {my(p=1); print1(p, ", "); forcomposite (n=1, nn, if (n%2, p *= n; print1(p, ", ")); ); } \\ _Michel Marcus_, Mar 13 2019
%Y A306848 Cf. A071904, A036691, A002866, A001147.
%K A306848 nonn
%O A306848 0,2
%A A306848 _Zhandos Mambetaliyev_, Mar 13 2019