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 | 1 |
| 2 | 23 |
| 3 | 457 |
| 4 | 891011 |
| 5 | 1213141516 |
| 6 | 171819202122 |
| 7 | 23242526272930 |
| 8 | 3132333435363738 |
| 9 | 394041424344454647 |
| 10 | 48495051525354555657 |
| 11 | 5859606162636465666768 |
| 12 | 697071727374757677787980 |