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 A004192 #13 Oct 25 2023 16:01:10 %S A004192 1,1,2,6,21,27,42,405,2304,88263,88263,861993,6100974,80207226, %T A004192 219287178,8634767031,88898722902,690824786553,8275073732046, %U A004192 238804001546121,466718002092342,4490717124909015,867067777270004211,4667948883761025852,48958903334001211551 %N A004192 Numbers obtained by reversing digits of factorial numbers. %t A004192 IntegerReverse[Range[0,30]!]//Sort (* Requires Mathematica version 10 or later *) (* _Harvey P. Dale_, Jul 14 2021 *) %Y A004192 A sorted version of A004153. %K A004192 nonn,base %O A004192 0,3 %A A004192 _N. J. A. Sloane_