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 | 9 |
| 2 | 81 |
| 3 | 724 |
| 4 | 6472 |
| 5 | 57851 |
| 6 | 517112 |
| 7 | 4622299 |
| 8 | 41317257 |
| 9 | 369321783 |
| 10 | 3301249634 |
| 11 | 29508817638 |
| 12 | 263769909867 |
| 13 | 2357755102376 |
| 14 | 21075220921085 |
| 15 | 188384678470177 |
| 16 | 1683910560899833 |
| 17 | 15051939468415328 |
| 18 | 134544486519385896 |
| 19 | 1202650255852445247 |
| 20 | 10750107085908359068 |