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 | 1 |
| 3 | 3 |
| 4 | 6 |
| 5 | 16 |
| 6 | 39 |
| 7 | 103 |
| 8 | 263 |
| 9 | 690 |
| 10 | 1791 |
| 11 | 4693 |
| 12 | 12247 |
| 13 | 32073 |
| 14 | 83869 |
| 15 | 219598 |
| 16 | 574658 |
| 17 | 1504540 |
| 18 | 3938272 |
| 19 | 10310703 |