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 A051260 #3 May 01 2014 02:49:07 %S A051260 1487,1241,18635111,20301765,70845391935385247435,22295845, %T A051260 975045119839962277471200,4683036088407831,1070886168667259594766160, %U A051260 70844547341354026205,51054721551471747728658198373574250149039 %N A051260 Every 25th Fibocyclotomic number divided by 5. %F A051260 a(n) = A051258(n)/5 %Y A051260 Cf. A051258, A051259. %K A051260 nonn %O A051260 1,1 %A A051260 _Antti Karttunen_, Oct 24 1999