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 | 15 |
| 6 | 46 |
| 7 | 133 |
| 8 | 436 |
| 9 | 1433 |
| 10 | 4878 |
| 11 | 16797 |
| 12 | 58837 |
| 13 | 208013 |
| 14 | 743034 |
| 15 | 2674457 |
| 16 | 9695281 |
| 17 | 35357671 |
| 18 | 129646266 |
| 19 | 477638701 |
| 20 | 1767268073 |
| 21 | 6564120555 |
| 22 | 24466283818 |
| 23 | 91482563641 |
| 24 | 343059672916 |
| 25 | 1289904147339 |
| 26 | 4861946609466 |