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 A023046 #16 Dec 19 2021 16:36:15 %S A023046 133496,1468457,17487988,224406930,3089233056,45440868120, %T A023046 711607724640,11824686110160,207863095910400,3854801333416320, %U A023046 75225258805132800,1541182421573625600,33078535427763302400,742312125779672448000,17385470058151215820800,424244381692864981248000 %N A023046 9th differences of factorial numbers. %H A023046 Milan Janjic, <a href="http://www.pmfbl.org/janjic/">Enumerative Formulas for Some Functions on Finite Sets</a> %H A023046 <a href="/index/Fa#factorial">Index entries for sequences related to factorial numbers</a> %t A023046 Differences[Range[0,30]!,9] (* _Harvey P. Dale_, Dec 19 2021 *) %K A023046 nonn %O A023046 0,1 %A A023046 _David W. Wilson_