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 A049717 #6 Apr 21 2021 14:05:36 %S A049717 3,8,15,26,41,56,79,100,127,158,189,228,263,308,351,398,455,508,567, %T A049717 626,687,760,827,906,977,1060,1143,1224,1323,1408,1507,1604,1701,1810, %U A049717 1917,2030,2149,2264,2387,2502,2639,2768,2899,3036 %N A049717 a(n) = T(n,n+1), array T as in A048149. %Y A049717 Cf. A048149. %K A049717 nonn %O A049717 0,1 %A A049717 _Clark Kimberling_