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 A195390 #27 Aug 12 2025 12:42:06
%S A195390 1,720,479001600,6402373705728000,620448401733239439360000,
%T A195390 265252859812191058636308480000000,
%U A195390 371993326789901217467999448150835200000000,1405006117752879898543142606244511569936384000000000,12413915592536072670862289047373375038521486354677760000000000
%N A195390 a(n) = (6*n)!.
%H A195390 Vincenzo Librandi, <a href="/A195390/b195390.txt">Table of n, a(n) for n = 0..75</a>
%F A195390 From _Amiram Eldar_, Apr 03 2021: (Start)
%F A195390 a(n) = A000142(A008588(n)).
%F A195390 Sum_{n>=0} 1/a(n) = A332892. (End)
%t A195390 (6*Range[0,10])! (* _Harvey P. Dale_, Dec 16 2013 *)
%o A195390 (Magma) [Factorial(6*n): n in [0..10]];
%Y A195390 Cf. A000142, A008588, A010050, A100732, A100733, A100734, A271946, A332892.
%K A195390 nonn,easy
%O A195390 0,2
%A A195390 _Vincenzo Librandi_, Sep 24 2011