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 A238305 #32 Jul 23 2025 10:50:47 %S A238305 2,3,3,6,4,5,14,6,5,8,27,12,6,7,12 %N A238305 Triangle E(n,k), 1<=k<=n, giving the cardinality of optimal ternary covering codes of empty spheres of length n and radius k. %C A238305 The next term is in the range 71-81. %C A238305 Right diagonal is equal to A086676. %H A238305 Jernej Azarija, M. A. Henning, S. Klavzar, <a href="https://arxiv.org/abs/1606.08143">(Total) Domination in Prisms</a>, arXiv preprint arXiv:1606.08143 [math.CO], 2016. %H A238305 Jernej Azarija, S. Klavzar, Y. Rho, S. Sim, <a href="https://www.fmf.uni-lj.si/~klavzar/preprints/Total-dom-cubes-submit.pdf">On domination-type invariants of Fibonacci cubes and hypercubes</a>, Preprint 2016. %H A238305 Jernej Azarija, S. Klavzar, Y. Rho, S. Sim, <a href="https://amc-journal.eu/index.php/amc/article/view/1172">On domination-type invariants of Fibonacci cubes and hypercubes</a>, Ars Mathematica Contemporanea, 14 (2018) 387-395. %H A238305 Kamiel P. F. Verstraten, <a href="/A238305/a238305.pdf">A generalization of the football pool problem</a>, Master's Thesis, Tilburg University, 2014. %e A238305 Triangle starts: %e A238305 01: 2 %e A238305 02: 3 3 %e A238305 03: 6 4 5 %e A238305 04: 14 6 5 8 %e A238305 05: 27 12 6 7 12 %e A238305 ... %Y A238305 Related to A060439, which has a code consisting of filled spheres instead of empty spheres. %Y A238305 Related to A230014, the triangle giving the cardinality of optimal binary covering codes of empty spheres. %Y A238305 See also A000983. %K A238305 nonn,hard,more,tabl %O A238305 1,1 %A A238305 _Kamiel P.F. Verstraten_, Feb 24 2014