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 A195391 #23 Aug 13 2025 05:30:10 %S A195391 1,5040,87178291200,51090942171709440000, %T A195391 304888344611713860501504000000, %U A195391 10333147966386144929666651337523200000000,1405006117752879898543142606244511569936384000000000,608281864034267560872252163321295376887552831379210240000000000,710998587804863451854045647463724949736497978881168458687447040000000000000 %N A195391 a(n) = (7*n)!. %H A195391 Vincenzo Librandi, <a href="/A195391/b195391.txt">Table of n, a(n) for n = 0..60</a> %t A195391 (7*Range[0, 8])! (* _Paolo Xausa_, Aug 12 2025 *) %o A195391 (Magma) [Factorial(7*n): n in [0..10]]; %o A195391 (PARI) a(n)=(7*n)! \\ _Charles R Greathouse IV_, Dec 27 2011 %Y A195391 Cf. A000152, A010050, A100732, A100733, A100734, A195390, A271947. %K A195391 nonn,easy %O A195391 0,2 %A A195391 _Vincenzo Librandi_, Sep 24 2011