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 | 4 |
| 4 | 6 |
| 5 | 12 |
| 6 | 31 |
| 7 | 73 |
| 8 | 183 |
| 9 | 476 |
| 10 | 1248 |
| 11 | 3322 |
| 12 | 8943 |
| 13 | 24271 |
| 14 | 66355 |
| 15 | 182538 |
| 16 | 504824 |
| 17 | 1402682 |
| 18 | 3913585 |
| 19 | 10959499 |
| 20 | 30792445 |
| 21 | 86775340 |
| 22 | 245204312 |
| 23 | 694603032 |
| 24 | 1972115945 |
| 25 | 5610955925 |
| 26 | 15994866669 |
| 27 | 45677496204 |
| 28 | 130661330526 |
| 29 | 374339736820 |
| 30 | 1074025873959 |
| 31 | 3085699969569 |
| 32 | 8876601230175 |