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 A204930 #5 Mar 30 2012 18:58:08 %S A204930 1,5,4,23,22,18,119,118,114,96,719,718,714,696,600,5039,5038,5034, %T A204930 5016,4920,4320,40319,40318,40314,40296,40200,39600,35280,362879, %U A204930 362878,362874,362856,362760,362160,357840,322560,3628799,3628798 %N A204930 Ordered differences of factorials. %C A204930 For a guide to related sequences, see A204892. %e A204930 a(1)=s(2)-s(1)=2!-1!=1 %e A204930 a(2)=s(3)-s(1)=3!-1!=5 %e A204930 a(3)=s(3)-s(2)=3!-2!=4 %e A204930 a(4)=s(4)-s(1)=4!-1!=23 %t A204930 (See the program at A204932.) %Y A204930 Cf. A204932, A204892. %K A204930 nonn %O A204930 1,2 %A A204930 _Clark Kimberling_, Jan 21 2012