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) |
|---|---|
| 3 | 1 |
| 4 | 22 |
| 5 | 305 |
| 6 | 3410 |
| 7 | 33621 |
| 8 | 305382 |
| 9 | 2619625 |
| 10 | 21554170 |
| 11 | 171870941 |
| 12 | 1337764142 |
| 13 | 10216988145 |
| 14 | 76862115330 |
| 15 | 571247591461 |
| 16 | 4203844925302 |
| 17 | 30687029023865 |
| 18 | 222518183370890 |
| 19 | 1604626924403181 |
| 20 | 11518132293452862 |