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 | 3 |
| 4 | 7 |
| 5 | 12 |
| 6 | 43 |
| 7 | 126 |
| 8 | 539 |
| 9 | 2304 |
| 10 | 11023 |
| 11 | 54682 |
| 12 | 284071 |
| 13 | 1509852 |
| 14 | 8195029 |
| 15 | 45080666 |
| 16 | 250641895 |
| 17 | 1404374248 |
| 18 | 7917211349 |
| 19 | 44848645458 |
| 20 | 255055231763 |
| 21 | 1455247360128 |
| 22 | 8326191290585 |
| 23 | 47752990403134 |