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 | 9 |
| 3 | 86 |
| 4 | 819 |
| 5 | 7801 |
| 6 | 74304 |
| 7 | 707741 |
| 8 | 6741189 |
| 9 | 64209406 |
| 10 | 611590599 |
| 11 | 5825362421 |
| 12 | 55486214784 |
| 13 | 528502745161 |
| 14 | 5033955780369 |
| 15 | 47948115749126 |
| 16 | 456702820643979 |
| 17 | 4350065964541441 |
| 18 | 41434107784092864 |
| 19 | 394657299879542981 |
| 20 | 3759086237836351149 |
| 21 | 35805062639924875246 |