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 | 1 |
| 1 | 11 |
| 2 | 99 |
| 3 | 693 |
| 4 | 3729 |
| 5 | 22275 |
| 6 | 259875 |
| 7 | 2900205 |
| 8 | 19490625 |
| 9 | 161008155 |
| 10 | 3451399875 |
| 11 | 48646261125 |
| 12 | 433937559825 |
| 13 | 6657275099475 |
| 14 | 145157601463875 |
| 15 | 2607210889408125 |
| 16 | 38347348433018625 |
| 17 | 476849547788488875 |