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 A268490 #8 Mar 30 2017 21:47:42 %S A268490 20,23,15,26,5,18,15,3,15,13,13,1,20,23,15,20,8,18,5,5,3,15,13,13,1, %T A268490 15,14,5,6,9,22,5,3,15,13,13,1,20,23,15,19,9,24,3,15,13,13,1,6,9,22,5, %U A268490 3,15,13,13,1,15,14,5,5,9,7,8,20,3,15,13,13,1,15,14,5,6,9,22,5,3,15,13,13,1,20,8,18,5,5,3,15,13,13,1,15,14,5,6,9,22,5,3,15,13,13,1,15,14,5,20,8 %N A268490 Spelling out the characters (digits and commas) of the sequence and replacing letters A..Z with numbers 1..26 gives back the sequence. %C A268490 A sequence with this property cannot start otherwise since 2 is the only digit equal to the first digit of the "code" (1-26) of the first letter of its English name. %e A268490 Spelling out the sequence data character-wise yields "two zero comma two three comma one five ..." %e A268490 Coding the letters A..Z by 1..26 yields again the sequence 20, 23, 15, 26, 5, 18, 15, 3, 15, 13, 13, ... %o A268490 (PARI) concat(apply(f=t->Vec(Vecsmall(concat(concat(apply(English,digits(t))),"comma")))%32,f(20))) \\ See A052360 for English() %Y A268490 Cf. A104059, A073029, A131744. %K A268490 nonn,base,word %O A268490 1,1 %A A268490 _M. F. Hasler_, Feb 06 2016