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 A010898 #10 Dec 27 2021 21:54:27 %S A010898 5,15,30,51,79 %N A010898 Minimal scope of a (5,n) difference triangle. %D A010898 CRC Handbook of Combinatorial Designs, 1996, p. 315. (But beware errors!) %H A010898 J. B. Shearer, <a href="http://www.research.ibm.com/people/s/shearer/dtsopt.html">Difference Triangle Sets: Known optimal solutions</a>. %H A010898 J. B. Shearer, <a href="http://www.research.ibm.com/people/s/shearer/dtslb.html">Difference Triangle Sets: Discoverers</a> %Y A010898 A row or column of array in A234943. %K A010898 nonn,hard %O A010898 1,1 %A A010898 _N. J. A. Sloane_ %E A010898 Corrected from Shearer's tables. - _N. J. A. Sloane_, Jan 08 2014