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 A060439 #21 Jun 29 2015 06:51:52 %S A060439 1,3,1,5,3,1,9,3,3,1,27,8,3,3,1 %N A060439 Triangle T(n,k), 1 <= k <= n, giving maximal size of ternary code of length n and covering radius k. %C A060439 Next term, T(6,1), is in range 71-73. - _Kamiel P.F. Verstraten_, Jun 29 2015 %D A060439 G. D. Cohen et al., Covering Codes, North-Holland, 1997, p. 174. %H A060439 W. Haas, <a href="http://dx.doi.org/10.1016/S0012-365X(00)00461-1">Binary and ternary codes of covering radius one: some new lower bounds</a>, Discrete Math., 245 (2002), 161-178. %H A060439 <a href="/index/Coa#covcod">Index entries for sequences related to covering codes</a> %e A060439 Triangle starts: %e A060439 1; %e A060439 3,1; %e A060439 5,3,1; %e A060439 9,3,3,1; %e A060439 ... %Y A060439 First column gives A004044. Cf. A060438, A060440. %K A060439 nonn,tabl,nice,more %O A060439 1,2 %A A060439 _N. J. A. Sloane_, Apr 07 2001