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 A051949 #11 Nov 02 2012 05:00:26 %S A051949 0,1,4,5,18,22,23,96,114,118,119,600,696,714,718,719,4320,4920,5016, %T A051949 5034,5038,5039,35280,39600,40200,40296,40314,40318,40319,322560, %U A051949 357840,362160,362760,362856,362874,362878,362879,3265920 %N A051949 Differences of two factorial numbers. %C A051949 Contribution from _Olivier Gérard_, Oct 09 2012: (Start) %C A051949 This sequence can also be seen as a triangular table starting at offset 1. %C A051949 0 %C A051949 1 %C A051949 4 5 %C A051949 18 22 23 %C A051949 96 114 118 119 %C A051949 600 696 714 718 719 %C A051949 4320 4920 5016 5034 5038 5039 %C A051949 First column is A001563, first diagonal is A033312, row sum is A206816. %C A051949 ; %C A051949 or starting at offset 0: %C A051949 0 %C A051949 1 4 %C A051949 5 18 22 %C A051949 23 96 114 118 %C A051949 119 600 696 714 718 %C A051949 719 4320 4920 5016 5034 5038 %C A051949 First column is A033312, first diagonal is n!-2, row sum is A185009. %C A051949 (End) %Y A051949 Cf. A204930 (ordered differences of factorial). %K A051949 nonn %O A051949 0,3 %A A051949 _N. J. A. Sloane_, Jan 05 2000