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 | 3 |
| 2 | 9 |
| 3 | 15 |
| 4 | 385 |
| 5 | 105 |
| 6 | 3003 |
| 7 | 1155 |
| 8 | 51051 |
| 9 | 36465 |
| 10 | 15015 |
| 11 | 692835 |
| 12 | 440895 |
| 13 | 255255 |
| 14 | 10140585 |
| 15 | 8580495 |
| 16 | 4849845 |