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 A153453 #15 Sep 20 2020 09:31:41 %S A153453 0,3,6,10,16,21,25,30,34,39,43,47,51,56,63,69,78,88,97,107,113,122, %T A153453 131,141,153,164,174,185,195,206,213,224,235,247,261,274,286,299,311, %U A153453 324,332,344,356,369,384,398,411,425,438,452,461,474,487,501,517,532,546,561,575,590,597 %N A153453 a(n) = letters(n) + a(n-1); a(0) = 0 in Spanish. %H A153453 Álvar Ibeas, <a href="/A153453/b153453.txt">Table of n, a(n) for n = 0..10000</a> %Y A153453 Cf. A067278, A011762. %K A153453 nonn,word %O A153453 0,2 %A A153453 _Rodolfo Kurchan_, Dec 26 2008 %E A153453 More terms from _Álvar Ibeas_, Sep 20 2020