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 | 17 |
| 2 | 187 |
| 3 | 1598 |
| 4 | 11594 |
| 5 | 74477 |
| 6 | 435268 |
| 7 | 2355265 |
| 8 | 11950456 |
| 9 | 57389960 |
| 10 | 262741086 |
| 11 | 1153256370 |
| 12 | 4875584955 |
| 13 | 19928324460 |
| 14 | 79000508546 |
| 15 | 304554050669 |
| 16 | 1144374191351 |
| 17 | 4199521413019 |
| 18 | 15076785650771 |