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 | 31 |
| 2 | 259 |
| 3 | 1711 |
| 4 | 13259 |
| 5 | 104181 |
| 6 | 838567 |
| 7 | 6839941 |
| 8 | 56392139 |
| 9 | 468718939 |
| 10 | 3921391169 |
| 11 | 32982034061 |
| 12 | 278635097351 |
| 13 | 2362736395895 |
| 14 | 20099255075641 |
| 15 | 171451320170481 |
| 16 | 1466033625495387 |
| 17 | 12562096168712455 |
| 18 | 107842286116562887 |