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 | 2 |
| 1 | 19 |
| 2 | 311 |
| 3 | 3671 |
| 4 | 38873 |
| 5 | 386093 |
| 6 | 3681131 |
| 7 | 34136029 |
| 8 | 310248241 |
| 9 | 2777105129 |
| 10 | 24563311309 |
| 11 | 215187847711 |
| 12 | 1870358526653 |
| 13 | 16149760533341 |
| 14 | 138666449011757 |
| 15 | 1184895616861903 |
| 16 | 10082409897709157 |
| 17 | 85476377250109733 |
| 18 | 722285281729443799 |
| 19 | 6085631874569939777 |