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 A068334 #19 Apr 14 2021 09:23:55
%S A068334 1,2,3,4,9,10,61,62,497,1492,26857,26858,6445921,6445922,786402485,
%T A068334 21232867096,10531502079617,10531502079618,314049392014208761,
%U A068334 314049392014208762,33736441887734362049089,6173768865455388254983288
%N A068334 a(1) = 1; a(n+1) = 1 + Product_{k|n} a(k), product is over the positive divisors, k, of n.
%H A068334 Seiichi Manyama, <a href="/A068334/b068334.txt">Table of n, a(n) for n = 1..66</a>
%e A068334 a(7) = 1 + a(1)*a(2)*a(3)*a(6) = 1 + 1*2*3*10 = 61.
%t A068334 Nest[Append[#1, 1 + Times @@ #1[[Divisors[#2] ]] ] & @@ {#, Length[#]} &, {1}, 21] (* _Michael De Vlieger_, Apr 13 2021 *)
%o A068334 (PARI) lista(nn) = {my(va = vector(nn)); va[1] = 1; for (n=2, nn, my(d=divisors(n-1)); va[n] = 1 + prod(k=1, #d, va[d[k]]);); va;} \\ _Michel Marcus_, Apr 13 2021
%Y A068334 Cf. A068336, A343390.
%K A068334 nonn
%O A068334 1,2
%A A068334 _Leroy Quet_, Feb 27 2002