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 | 3 |
| 4 | 5 |
| 5 | 12 |
| 6 | 30 |
| 7 | 79 |
| 8 | 227 |
| 9 | 709 |
| 10 | 2318 |
| 11 | 8049 |
| 12 | 29372 |
| 13 | 112000 |
| 14 | 444855 |
| 15 | 1833072 |
| 16 | 7806724 |
| 17 | 34252145 |
| 18 | 154342391 |
| 19 | 712231465 |
| 20 | 3357126655 |
| 21 | 16119421175 |
| 22 | 78580665333 |