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.
| n | a(n) |
|---|---|
| 1 | 3456789 |
| 2 | 13141516171819 |
| 3 | 20212223242526 |
| 4 | 27282930313233 |
| 5 | 34353637383940 |
| 6 | 41424344454647 |
| 7 | 48495051525354 |
| 8 | 55565758596061 |
| 9 | 62636465666768 |
| 10 | 69707172737475 |
| 11 | 76777879808182 |
| 12 | 83848586878889 |
| 13 | 90919293949596 |
| 14 | 102103104105106107108 |
| 15 | 109110111112113114115 |