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 | 1 |
| 2 | 38 |
| 3 | 197 |
| 4 | 1233 |
| 5 | 12161 |
| 6 | 94647 |
| 7 | 754342 |
| 8 | 6315609 |
| 9 | 51451261 |
| 10 | 419287301 |
| 11 | 3440823171 |
| 12 | 28151759126 |
| 13 | 230214373993 |
| 14 | 1884441078027 |
| 15 | 15421094331443 |
| 16 | 126179660318827 |
| 17 | 1032563574110030 |
| 18 | 8449625624399977 |
| 19 | 69142892935838625 |
| 20 | 565800834676196151 |