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 | 2 |
| 2 | 2 |
| 3 | 2 |
| 4 | 3 |
| 5 | 3 |
| 6 | 5 |
| 7 | 7 |
| 8 | 13 |
| 9 | 29 |
| 10 | 53 |
| 11 | 109 |
| 12 | 277 |
| 13 | 809 |
| 14 | 2741 |
| 15 | 11789 |
| 16 | 64663 |
| 17 | 483281 |
| 18 | 5195977 |
| 19 | 85861889 |
| 20 | 2358926351 |
| 21 | 118185163069 |
| 22 | 12041724518809 |