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) |
|---|---|
| 2 | 434 |
| 3 | 104 |
| 4 | 80 |
| 5 | 182 |
| 6 | 427 |
| 7 | 1727 |
| 8 | 4147 |
| 9 | 7163 |
| 10 | 42031 |
| 11 | 165841 |
| 12 | 569257 |
| 13 | 2683909 |
| 14 | 10040081 |
| 15 | 39094849 |
| 16 | 155533969 |
| 17 | 717519401 |
| 18 | 3041377519 |
| 19 | 16076525809 |
| 20 | 71749935913 |