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 A061406 #11 Aug 15 2017 22:26:58
%S A061406 645120,20643840,1486356480,178362777600,31391848857600,
%T A061406 7534043725824000,2350621642457088000,921443683843178496000,
%U A061406 442292968244725678080000,254760749708961990574080000
%N A061406 Denominators in the series for Bessel function J7(x).
%H A061406 G. C. Greubel, <a href="/A061406/b061406.txt">Table of n, a(n) for n = 0..220</a> (terms 0..50 from T. D. Noe)
%H A061406 <a href="/index/Be#Bessel">Index entries for sequences related to Bessel functions or polynomials</a>
%t A061406 Denominator[Take[CoefficientList[Series[BesselJ[7, x], {x, 0, 50}], x], {8, -1, 2}]] (* _G. C. Greubel_, Aug 15 2017 *)
%Y A061406 J1: A002474, J2: A002506, J3: A014401 for formula etc.
%K A061406 nonn,easy
%O A061406 0,1
%A A061406 _Frank Ellermann_, Jun 11 2001