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 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 3
 2, 3, 3, 6, 4, 5, 14, 6, 5, 8, 27, 12, 6, 7, 12 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS The next term is in the range 71-81. Right diagonal is equal to A086676. LINKS Table of n, a(n) for n=1..15. Jernej Azarija, M. A. Henning, S. Klavzar, (Total) Domination in Prisms, arXiv preprint arXiv:1606.08143 [math.CO], 2016. Jernej Azarija, S. Klavzar, Y. Rho, S. Sim, On domination-type invariants of Fibonacci cubes and hypercubes, Preprint 2016. Jernej Azarija, S. Klavzar, Y. Rho, S. Sim, On domination-type invariants of Fibonacci cubes and hypercubes, Ars Mathematica Contemporanea, 14 (2018) 387-395. Kamiel P. F. Verstraten, A generalization of the football pool problem, Master's Thesis, Tilburg University, 2014. EXAMPLE Triangle starts: 01: 2 02: 3 3 03: 6 4 5 04: 14 6 5 8 05: 27 12 6 7 12 ... CROSSREFS Related to A060439, which has a code consisting of filled spheres instead of empty spheres. Related to A230014, the triangle giving the cardinality of optimal binary covering codes of empty spheres. See also A000983. Sequence in context: A274824 A141729 A272400 * A337660 A049990 A173739 Adjacent sequences: A238302 A238303 A238304 * A238306 A238307 A238308 KEYWORD nonn,hard,more,tabl AUTHOR Kamiel P.F. Verstraten, Feb 24 2014 STATUS approved

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Last modified July 14 03:51 EDT 2024. Contains 374291 sequences. (Running on oeis4.)