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 A298728 #16 Jan 28 2018 22:50:26
%S A298728 193,194,195,196,197,198,199,200,201,209,210,211,212,213,214,215,216,
%T A298728 217,226,227,228,229,230,231,232,233
%N A298728 EBCDIC codes for upper case letters.
%C A298728 Extended Binary Coded Decimal Interchange Code.
%H A298728 IBM Corp, <a href="ftp://ftp.software.ibm.com/software/globalization/gcoc/attachments/CP00037.pdf">Code Page 37</a>
%H A298728 Wikipedia, <a href="https://en.wikipedia.org/wiki/EBCDIC">EBCDIC</a>
%e A298728 Hexadecimal values: C1, C2, C3, C4, C5, C6, C7, C8, C9, D1, D2, D3, D4, D5, D6, D7, D8, D9, E2, E3, E4, E5, E6, E7, E8, E9.
%e A298728 For example, 'A' is C1, 'B' is C2, ..., 'Z' is E9.
%t A298728 With[{r = Range@ 9}, Flatten@ {2^7 + 2^6 + {r, 2^4 + r, 2^5 + Rest[r]}}] (* _Michael De Vlieger_, Jan 28 2018 *)
%Y A298728 Cf. A121378, A298720.
%K A298728 base,fini,full,nonn,word
%O A298728 1,1
%A A298728 _Yohei Furutono_, Jan 25 2018