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 | 1 |
| 2 | 17 |
| 3 | 262 |
| 4 | 3985 |
| 5 | 60626 |
| 6 | 925190 |
| 7 | 14168988 |
| 8 | 217721745 |
| 9 | 3355615450 |
| 10 | 51855874642 |
| 11 | 803232328548 |
| 12 | 12467572005382 |
| 13 | 193873026294052 |
| 14 | 3019674502600220 |
| 15 | 47101568276955512 |
| 16 | 735663252850019217 |
| 17 | 11503661742608944170 |
| 18 | 180077229781765344602 |
| 19 | 2821666487800835457300 |