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 A210280 #13 Sep 08 2022 08:46:01
%S A210280 1,720,1779148800,148953184174080000,126983900296423931904000000,
%T A210280 614812159599342234168301977600000000,
%U A210280 11942354952042770431904585727413846016000000000
%N A210280 (7n)!/7^n.
%H A210280 Vincenzo Librandi, <a href="/A210280/b210280.txt">Table of n, a(n) for n = 0..60</a>
%F A210280 E.g.f.: 1/(1-x^7/7).
%t A210280 Table[(7 n)!/7^n, {n, 0, 10}] (* _Vincenzo Librandi_, Feb 15 2013 *)
%o A210280 (Magma)[Factorial(7*n)/7^n: n in [0..10]]; // _Vincenzo Librandi_, Feb 15 2013
%Y A210280 Cf. A210279, A210278, A210277, A000680, A067630, A084939, A084940, A084941, A084942, A084943, A084944, A087127, A001147, A132101
%K A210280 nonn,easy
%O A210280 0,2
%A A210280 _Mohammad K. Azarian_, Apr 12 2012