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 | 0 |
| 2 | 1 |
| 3 | 12 |
| 4 | 166 |
| 5 | 2154 |
| 6 | 27825 |
| 7 | 359381 |
| 8 | 4641588 |
| 9 | 59948424 |
| 10 | 59948425 |
| 11 | 774263682 |
| 12 | 9999999999 |
| 13 | 10000000000 |
| 14 | 129154966501 |
| 15 | 1668100537199 |
| 16 | 1668100537200 |
| 17 | 21544346900318 |
| 18 | 278255940220712 |
| 19 | 3593813663804627 |
| 20 | 46415888336127788 |
| 21 | 599484250318941014 |
| 22 | 7742636826811270597 |
| 23 | 99999999999999999999 |