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 A096897 #3 Mar 30 2012 17:29:16 %S A096897 6,20,15,72,35,28,63,272,99,45,143,88,195,77,66,1056,323,117,399,104, %T A096897 91,165,575,304,675,221,783,120,899,204,1023,4160,187,357,170,153, %U A096897 1443,437,247,336,1763,228,1935,209,190,621,2303,1120,2499,725,391,273,2915 %N A096897 Least semiperimeter of primitive Pythagorean triangles with even leg 4n. %Y A096897 Cf. A088557, A088558, A096891-A096900. %K A096897 nonn %O A096897 1,1 %A A096897 _Ray Chandler_, Jul 14 2004