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 | 10 |
| 3 | 97 |
| 4 | 932 |
| 5 | 8916 |
| 6 | 85090 |
| 7 | 810846 |
| 8 | 7719048 |
| 9 | 73431340 |
| 10 | 698187400 |
| 11 | 6635738209 |
| 12 | 63047912372 |
| 13 | 598885073788 |
| 14 | 5687581936284 |
| 15 | 54005562798252 |
| 16 | 512728901004816 |
| 17 | 4867263839614716 |
| 18 | 46199494669833400 |
| 19 | 438481077306427924 |
| 20 | 4161316466910824272 |