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 | 2 |
| 2 | 3 |
| 3 | 19 |
| 4 | 23 |
| 5 | 281 |
| 6 | 983 |
| 7 | 2621 |
| 8 | 3931 |
| 9 | 62903 |
| 10 | 212297 |
| 11 | 1698377 |
| 12 | 7925759 |
| 13 | 99071989 |
| 14 | 435916751 |
| 15 | 5448959389 |
| 16 | 17981565983 |
| 17 | 1390574436037 |
| 18 | 7072749286739 |
| 19 | 50923794864521 |
| 20 | 178233282025823 |
| 21 | 2851732512413171 |
| 22 | 30893768884476019 |