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 | 22 |
| 2 | 355 |
| 3 | 5265 |
| 4 | 77224 |
| 5 | 1155420 |
| 6 | 17893196 |
| 7 | 288843260 |
| 8 | 4876196776 |
| 9 | 86194186584 |
| 10 | 1595481972864 |
| 11 | 30908820004608 |
| 12 | 626110382381184 |
| 13 | 13246845128678016 |
| 14 | 292374329134060800 |
| 15 | 6723367631258860800 |
| 16 | 160883166944083161600 |
| 17 | 4001062259532015244800 |