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 A121054 #4 Mar 30 2012 16:50:29 %S A121054 4,16,28,44,68,80,104,140,152,180,216,240,276,312,336,360,420,456,484, %T A121054 532,544,604,664,688,736,784,820,868,928,952,1004,1088,1136,1160,1220, %U A121054 1256,1304,1400,1436,1508,1556,1592,1664,1724,1772,1824,1920,1956,2016,2112 %N A121054 Sizes of successive clusters in f.c.c. lattice centered at a tetrahedral hole. %D A121054 N. J. A. Sloane and B. K. Teo, Theta series and magic numbers for close-packed spherical clusters, J. Chem. Phys. 83 (1985) 6520-6534. %Y A121054 Partial sums of A005886. Equals 2*A121055. %K A121054 nonn %O A121054 0,1 %A A121054 _N. J. A. Sloane_, Aug 09 2006