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 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 5 |
| 6 | 13 |
| 7 | 35 |
| 8 | 101 |
| 9 | 299 |
| 10 | 916 |
| 11 | 2859 |
| 12 | 9087 |
| 13 | 29247 |
| 14 | 95188 |
| 15 | 312490 |
| 16 | 1033715 |
| 17 | 3441280 |
| 18 | 11520726 |
| 19 | 38758234 |
| 20 | 130962986 |
| 21 | 444251957 |
| 22 | 1512321767 |
| 23 | 5164750890 |
| 24 | 17689837577 |
| 25 | 60752024243 |
| 26 | 209154519704 |
| 27 | 721707099632 |
| 28 | 2495565928527 |
| 29 | 8646220929912 |
| 30 | 30010588561120 |