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 A107486 #3 Mar 31 2012 10:26:04 %S A107486 1,5,10,20,35,60,60,110,70,220,140,280,210,385,660,630,420,840,1430, %T A107486 910,770,3360,2100,2380,1820,1540,5040,3465,3850,3080,2730,2310,6545, %U A107486 5005,10780,11220,9660,7140,5460,6930 %N A107486 One-sixth the smallest semiperimeter common to exactly n Pythagorean triangles. %F A107486 a(n)=A099830(n)/12. %K A107486 nonn %O A107486 1,2 %A A107486 _Lekraj Beedassy_, May 28 2005