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 | 3 |
| 3 | 19 |
| 4 | 175 |
| 5 | 2111 |
| 6 | 31321 |
| 7 | 550810 |
| 8 | 11194177 |
| 9 | 258068893 |
| 10 | 6653230111 |
| 11 | 189653427206 |
| 12 | 5922604033567 |
| 13 | 201075967613262 |
| 14 | 7373834652641003 |
| 15 | 290474615891145106 |
| 16 | 12232735359488840833 |
| 17 | 548429151685677131389 |