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 A117320 #2 Mar 31 2012 10:29:09 %S A117320 12,24,21,45,15,528,1155,40,468,60,455,165,275,1288,37961,6160,399, %T A117320 420,17480,52080,84,46123872,140,35,2275,68207909,9673916261759,92008, %U A117320 840,827811,8040130371,67599,91,1505,144,308,1540,2405,84082157037959 %N A117320 Bases of right triangles that are solutions to Leech's problem A117319. %Y A117320 Cf. A117319, A117321 [corresponding heights]. %K A117320 nonn %O A117320 1,1 %A A117320 _Hugo Pfoertner_, Mar 07 2006