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 A238166 #12 Dec 30 2017 17:26:20 %S A238166 1,1,0,5,8,2,6,4,4,4,4,3,8,8,1,7,8,5,4,0,0,8,8,4,5,7,6,8,8,7,6,6,8,0, %T A238166 9,8,4,5,4,9,7,9,6,2,4,2,4,1,9,6,0,4,1,5,3,5,1,7,2,9,7,9,4,0,5,6,3,8, %U A238166 0,6,4,6,1,8,3,0,7,0,1,4,6,9,3,3,8,6,0,1,7,7,2,5,3,9,0,0,5,7,5,7 %N A238166 Decimal expansion of sum_(n>=1) H(n,2)/n^4 where H(n,2) = A007406(n)/A007407(n) is the n-th harmonic number of order 2. %H A238166 G. C. Greubel, <a href="/A238166/b238166.txt">Table of n, a(n) for n = 1..10000</a> %H A238166 Philippe Flajolet, Bruno Salvy, <a href="http://algo.inria.fr/flajolet/Publications/FlSa98.pdf">Euler Sums and Contour Integral Representations</a>, Experimental Mathematics 7:1 (1998) page 16. %F A238166 Equals zeta(3)^2 - zeta(6)/3. %e A238166 1.1058264444388178540088457688766809845497962424196... %t A238166 RealDigits[Zeta[3]^2 - 1/3*Zeta[6], 10, 100][[1]] %o A238166 (PARI) zeta(3)^2-Pi^6/2835 /* _Michel Marcus_, Jul 04 2014 */ %Y A238166 Cf. A007406, A007407, A152648, A152649, A152651, A238167, A238168, A238169. %K A238166 nonn,cons,easy %O A238166 1,4 %A A238166 _Jean-François Alcover_, Feb 19 2014