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 | 3 |
| 2 | 11 |
| 3 | 105 |
| 4 | 1487 |
| 5 | 28065 |
| 6 | 662111 |
| 7 | 18744705 |
| 8 | 619117727 |
| 9 | 23370059265 |
| 10 | 992427775391 |
| 11 | 46826909698305 |
| 12 | 2430439250993567 |
| 13 | 137613995282046465 |
| 14 | 8441167989376455071 |
| 15 | 557605650894240475905 |
| 16 | 39465264036137261935007 |
| 17 | 2979418998248159878129665 |