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 A199765 #16 Aug 14 2013 14:00:43 %S A199765 1,4,10,12,18,26,30,34,38,42,48,50,58,68,76,72,78 %N A199765 Number of Landsberg zones in the n-th Brillouin zone of a rectangular lattice. %C A199765 This sequence enumerates the number of polygons that make up the n-th Brillouin zone of a two-dimensional rectangular lattice. Brillouin zones play an important role in the description of wave propagation in crystals. Their tiling of the lattice's fundamental domain is also known in physics as the "reduced zone scheme", so, alternatively, this sequence enumerates the number of "pieces" in the reduced zone scheme. %D A199765 M.G. Jurado-Taracena, "On Brillouin zones and related constructions", Rev. Mex. Fis. E, 57 (2011), 32-37. %Y A199765 Cf. A180603 %K A199765 nonn,more %O A199765 1,2 %A A199765 _MG Jurado-Taracena_, Nov 10 2011