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 | 23 |
| 2 | 187 |
| 3 | 1223 |
| 4 | 9347 |
| 5 | 72573 |
| 6 | 577279 |
| 7 | 4654925 |
| 8 | 37943939 |
| 9 | 311837075 |
| 10 | 2579551497 |
| 11 | 21450968309 |
| 12 | 179155113323 |
| 13 | 1501673922057 |
| 14 | 12625149738521 |
| 15 | 106416815593683 |
| 16 | 898941182378771 |
| 17 | 7607848721495845 |
| 18 | 64489085542582579 |
| 19 | 547401698354394021 |