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 A049694 #7 Aug 06 2021 17:31:42 %S A049694 1,6,10,15,22,31,38,49,62,73,88,105,116,137,158,173,198,223,240,269, %T A049694 298,319,348,383,408,441,480,507,548,593,620,667,706,739,790,833,868, %U A049694 921,978,1015,1072,1133,1168,1233,1298,1339,1402,1469,1516,1583,1654,1705 %N A049694 a(n) = T(n,n+3), array T as in A049687. %K A049694 nonn %O A049694 0,2 %A A049694 _Clark Kimberling_ %E A049694 More terms from _Sean A. Irvine_, Aug 06 2021