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 A126576 #10 Oct 10 2019 13:46:48
%S A126576 1,6,60,140,630,31416,34580,91080,1093950,58549260,6702696,61910940,
%T A126576 2379795600,1197892080,21742542360,21741799002768,143830236550,
%U A126576 2559047531040,38886283310,333903908520,24063048428483064
%N A126576 a(n) = denominator of the sum of reciprocals of the terms in n-th row of triangle A126571.
%e A126576 Row 4 of triangle A126571 is (4,7,5,7).
%e A126576 So a(4) is the denominator of 1/4 +1/7 +1/5 + 1/7 = 103/84.
%t A126576 f[m_, n_] := Block[{k = 0, c = n},While[c > 0,k++;While[GCD[k, m] > 1, k++ ];c--;];k];Table[Denominator@Sum[1/f[m, n], {m, n}], {n, 22}] (* _Ray Chandler_, Dec 29 2006 *)
%Y A126576 Cf. A126571, A126575.
%K A126576 frac,nonn
%O A126576 1,2
%A A126576 _Leroy Quet_, Dec 28 2006
%E A126576 Extended by _Ray Chandler_, Dec 29 2006