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 A240534 #8 Sep 08 2022 08:46:07
%S A240534 1,10,50,500,1250,2500,12500,125000,156250,1562500,1562500,15625000,
%T A240534 39062500,390625000,1953125000,3906250000,2441406250,24414062500,
%U A240534 122070312500,1220703125000,610351562500,6103515625000,30517578125000
%N A240534 a(n) = denominators of n!/10^n.
%H A240534 Vincenzo Librandi, <a href="/A240534/b240534.txt">Table of n, a(n) for n = 0..200</a>
%t A240534 Table[Denominator[n!/10^n], {n, 0, 30}]
%o A240534 (Magma) [Denominator(Factorial(n)/10^n): n in [0..30]];
%Y A240534 Cf. A000142, A011557, A014973, A074143, A092043, A208529.
%K A240534 nonn,frac
%O A240534 0,2
%A A240534 _Vincenzo Librandi_, Apr 14 2014