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 A076180 #4 Mar 31 2012 10:29:01 %S A076180 1,2,5,8,13,23,35,63,76,86,123,163,226,264,287,374,514,523,576,664, %T A076180 715,787,924,927,963,1074,1137,1364,1487,1576,1786,2176,2475,2614, %U A076180 2837,2877,2925,3536,3576,4025,4487,4638,5215,6026,6527,6726,6774 %N A076180 Indices of spheres mentioned in A071609. %D A076180 J. H. Conway and N. J. A. Sloane, "Sphere Packings, Lattices and Groups", Springer-Verlag, Table 4.3, p. 107. %H A076180 Hugo Pfoertner, <a href="http://www.randomwalk.de/sequences/sphercnt.txt">Spheres containing record numbers of lattice points of Z^3</a> %F A076180 a(n) = k for which A000378(k) = A071609(n) %e A076180 a(7)=35 because A000378(35)=A071609(7)=41 %Y A076180 Cf. A000378, A005875, A071609. %K A076180 nonn %O A076180 1,2 %A A076180 _Hugo Pfoertner_, Nov 01 2002