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 A331481 #18 Jul 27 2024 22:06:03
%S A331481 26,6,19,20,6,6,19,19,5,14,20,5,20,20,6,6,19,19,5,14,20,20,20,20,20,
%T A331481 20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,6,6,6,6,6,6,6,6,6,6,6,6,
%U A331481 6,6,6,6,6,6,6,6,19,19,19,19,19,19,19,19,19,19,19,19
%N A331481 Position of the first letter of n-th (in English) in the alphabet.
%e A331481 'First' begins with 'F', the sixth letter, hence a(1)=6.
%t A331481 a[n_] := LetterNumber @ Characters[IntegerName[n, {"English","Ordinal"}]][[1]]; Array[a, 100, 0] (* _Amiram Eldar_, Jan 18 2020 *)
%o A331481 (Python)
%o A331481 from num2words import num2words
%o A331481 import unidecode
%o A331481 def A331481(n):
%o A331481 return ord(unidecode.unidecode(num2words(n, to='ordinal')).lower()[0]) - 96 # _Chai Wah Wu_, Feb 27 2020
%Y A331481 Cf. A005606 (analog for cardinal numbers).
%K A331481 nonn,word
%O A331481 0,1
%A A331481 _J. Marcel Feenstra_, Jan 18 2020