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 | 2 |
| 3 | 2 |
| 4 | 5 |
| 5 | 9 |
| 6 | 21 |
| 7 | 43 |
| 8 | 101 |
| 9 | 226 |
| 10 | 556 |
| 11 | 1333 |
| 12 | 3365 |
| 13 | 8500 |
| 14 | 22007 |
| 15 | 57258 |
| 16 | 151264 |
| 17 | 401761 |
| 18 | 1077063 |
| 19 | 2902599 |
| 20 | 7871250 |
| 21 | 21440642 |
| 22 | 58672589 |
| 23 | 161155637 |
| 24 | 444240627 |
| 25 | 1228400744 |
| 26 | 3406668865 |
| 27 | 9472308269 |
| 28 | 26402207803 |
| 29 | 73755064178 |