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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 12 |
| 6 | 33 |
| 7 | 98 |
| 8 | 305 |
| 9 | 1002 |
| 10 | 3424 |
| 11 | 12016 |
| 12 | 43230 |
| 13 | 158516 |
| 14 | 590621 |
| 15 | 2230450 |
| 16 | 8521967 |
| 17 | 32889238 |
| 18 | 128064009 |
| 19 | 502590642 |
| 20 | 1986357307 |
| 21 | 7900377892 |
| 22 | 31602819524 |
| 23 | 127076645038 |
| 24 | 513419837168 |
| 25 | 2083414420394 |
| 26 | 8488377206876 |
| 27 | 34712566540014 |
| 28 | 142443837953632 |