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 A247557 #44 Mar 14 2019 04:55:39 %S A247557 1,7,26,79,182,333,693,1180,1999,3247 %N A247557 Number of rectangles formed by the absolute leader classes of the seven-dimensional integer lattice as a function of the infinity norm n and having a unique perimeter, where the rectangles have one common lattice point being the origin of the seven-dimensional integer lattice. %C A247557 An absolute leader class is a term used in coding theory to label special integer lattice points. In the seven-dimensional integer lattice Z^7 we have for the infinity norm n=1 the following absolute leader classes using the Conway abbreviation: (1,0^6),(1^2,0^5),(1^3,0^4),(1^4,0^3),(1^5,0^2),(1^6,0^1),(1^7). These lattice points are the representatives of sets of lattice points formed by the signed permutation of the representative lattice point. The number of absolute leader classes as function of the infinity norm in a d-dimensional integer lattice is given by C(d+n-1,n). This sequence has been found by creating a histogram of the perimeters of the rectangles found in sequence A240934 and counting the ones with frequency 1. %H A247557 P. A. J. G. Chevalier, <a href="https://www.researchgate.net/profile/Philippe_Chevalier2/publication/260598331">On a Mathematical Method for Discovering Relations Between Physical Quantities: a Photonics Case Study</a>, Slides from a talk presented at ICOL2014. %H A247557 P. A. J. G. Chevalier, <a href="https://www.researchgate.net/profile/Philippe_Chevalier2/publication/262067273">A "table of Mendeleev" for physical quantities?</a>, Slides from a talk, May 14 2014, Leuven, Belgium. %H A247557 Philippe A. J. G. Chevalier, <a href="https://www.researchgate.net/publication/297497200_Dimensional_exploration_techniques_for_photonics">Dimensional exploration techniques for photonics</a>, Slides of a talk, 2016. %H A247557 Patrick Rault and Christine M. Guillemot, <a href="http://dx.doi.org/10.1117/12.298397">Lattice vector quantization with reduced or without look-up table</a>, Proc. SPIE 3309, Visual Communications and Image Processing '98,(1998), 851. %H A247557 Adriana Vasilache and Ioan Tabus, <a href="http://dx.doi.org/10.1117/12.481913">Image coding using multiple scale leader lattice vector quantization</a>, Proc. SPIE 5014, Image Processing: Algorithms and Systems II, 9(2003). %e A247557 For n=1 the a(1)=1 unique perimeter is found in the absolute leader class (1^2,0^5). The perimeters of rectangles that are found in the absolute leader classes (1,0^6), (1^3,0^4), (1^4,0^3), (1^5,0^2), (1^6,0^1), (1^7) generate perimeters with multiplicity higher than 1. %Y A247557 Cf. A240934. %K A247557 nonn,more %O A247557 1,2 %A A247557 _Philippe A.J.G. Chevalier_, Sep 19 2014