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 | 7 |
| 2 | 63 |
| 3 | 693 |
| 4 | 9009 |
| 5 | 135135 |
| 6 | 2297295 |
| 7 | 43648605 |
| 8 | 916620705 |
| 9 | 21082276215 |
| 10 | 527056905375 |
| 11 | 14230536445125 |
| 12 | 412685556908625 |
| 13 | 12793252264167375 |
| 14 | 422177324717523375 |
| 15 | 14776206365113318125 |
| 16 | 546719635509192770625 |