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 A015632 #15 Jul 13 2013 12:01:49 %S A015632 1,2,4,6,12,14,26,33,46,52,84,91,137,152,174,199,279,295,397,425,475, %T A015632 513,663,692,819,876,986,1044,1286,1315,1593,1700,1838,1939,2123,2186, %U A015632 2582,2711,2905,3008,3498,3564,4106,4272,4476,4666,5316,5433,5985 %N A015632 Number of ordered triples of integers from [ 1,n ] with no common factors between pairs. %H A015632 Reinhard Zumkeller, <a href="/A015632/b015632.txt">Table of n, a(n) for n = 1..500</a> %F A015632 a(n) ~ k * n^3 where k is 1/6 * A065473 = 0.04779.... [_Charles R Greathouse IV_, Nov 14 2011] %o A015632 (Haskell) %o A015632 a015632 n = length [(x,y,z) | z <- [1..n], y <- [1..z], gcd y z == 1, %o A015632 x <- [1..y], gcd x z == 1, gcd x y == 1] %o A015632 -- _Reinhard Zumkeller_, Nov 14 2011 %K A015632 nonn %O A015632 1,2 %A A015632 _Olivier Gérard_