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 A210278 #19 May 27 2025 12:13:17
%S A210278 1,24,145152,10461394944,3892643213082624,4963587213865915514880,
%T A210278 16976183027980227752723742720,132264293969742655099733137120296960,
%U A210278 2088743125114618199924764850166056689336320,61246577083125859615725138685776750112964471685120
%N A210278 (5n)!/5^n.
%H A210278 Vincenzo Librandi, <a href="/A210278/b210278.txt">Table of n, a(n) for n = 0..90</a>
%F A210278 E.g.f.: 1/(1-x^5/5).
%t A210278 Table[(5 n)!/5^n, {n, 0, 10}] (* _Vincenzo Librandi_, Feb 15 2013 *)
%t A210278 With[{nn=100},Take[CoefficientList[Series[1/(1-x^5/5),{x,0,nn}],x] Range[0,nn]!,{1,-1,5}]] (* _Harvey P. Dale_, May 27 2025 *)
%o A210278 (Magma)[Factorial(5*n)/5^n: n in [0..10]]; // _Vincenzo Librandi_, Feb 15 2013
%Y A210278 Cf. A210277, A000680, A067630, A084939, A084940, A084941, A084942, A084943, A084944, A087127, A001147, A132101.
%K A210278 nonn,easy
%O A210278 0,2
%A A210278 _Mohammad K. Azarian_, Mar 20 2012