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) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 13 |
| 3 | 157 |
| 4 | 2127 |
| 5 | 25547 |
| 6 | 331007 |
| 7 | 4172107 |
| 8 | 52305307 |
| 9 | 647665707 |
| 10 | 10216432707 |
| 11 | 122621414707 |
| 12 | 1473657200707 |
| 13 | 20126330410707 |
| 14 | 241540165130707 |
| 15 | 3120702223570707 |
| 16 | 37450626705270707 |
| 17 | 473627744665470707 |
| 18 | 6125757360430070707 |
| 19 | 75533532545361070707 |