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 A133587 #4 Oct 04 2012 10:28:59 %S A133587 4,6,4,2,10,12,14,2,4,2,6,2,4,1,2,2,2,12,2,2,1 %N A133587 Conjectured order of the symmetry group of the (numerically computed) least-perimeter cluster of n nonoverlapping circles. %C A133587 This can be thought of as the order of the symmetry group of the minimum-energy configuration of n two-dimensional bubbles in a plane. a(1) is infinite, because one bubble forms a circle, which has a continuous symmetry group containing rotations of arbitrary angles. So far, the actual symmetry groups are all dihedral, except for a(15) and a(22), which are trivial (their configurations have no symmetries). %D A133587 Cox, S. J., F. Graner, M. F. Vaz, C. Monnereau-Pittet and N. Pittet, 2003, Minimal perimeter for N identical bubbles in two dimensions: calculations and simulations, Philos. Mag. 83, 1393-1406. %D A133587 F. Morgan, Soap bubble clusters, Rev. Mod. Phys. Vol. 79 (2007), pp. 821-827. %H A133587 R. L. Graham and N. J. A. Sloane, <a href="http://neilsloane.com/doc/RLG/138.pdf">Penny-Packing and Two-Dimensional Codes</a>, Discrete and Comput. Geom. 5 (1990), 1-11. %e A133587 a(3) = 6 because three planar bubbles arrange themselves in an equilateral-triangle-type configuration with symmetry group D_3, of order 6. %Y A133587 Cf. A133491. %K A133587 nonn %O A133587 2,1 %A A133587 _Keenan Pepper_, Dec 27 2007