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 | 0 |
| 1 | 2 |
| 2 | 5 |
| 3 | 13 |
| 4 | 43 |
| 5 | 193 |
| 6 | 1181 |
| 7 | 9547 |
| 8 | 99523 |
| 9 | 1292831 |
| 10 | 20374363 |
| 11 | 380964631 |
| 12 | 8300770763 |
| 13 | 207647281343 |
| 14 | 5890165284053 |
| 15 | 187490458428149 |