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 A117321 #2 Mar 31 2012 10:29:09 %S A117321 5,7,20,28,8,455,68,9,595,11,528,52,252,255,3120,111,40,29,561,4199, %T A117321 13,874055,51,12,3828,654280020,289469937120,2145,41,30940,3727393780, %U A117321 520,60,312,17,75,741,1428,135429570100440,49610080,17020,19,97240,585 %N A117321 Heights of right triangles that are solutions to Leech's problem A117319. %Y A117321 Cf. A117319, A117320 [corresponding bases]. %K A117321 nonn %O A117321 1,1 %A A117321 _Hugo Pfoertner_, Mar 07 2006