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) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 6 |
| 4 | 66 |
| 5 | 3003 |
| 6 | 66066 |
| 7 | 617716 |
| 8 | 3544453 |
| 9 | 6172882716 |
| 10 | 30416261403 |
| 11 | 61728399382716 |
| 12 | 66056806460865066 |
| 13 | 3549632679762369453 |
| 14 | 354963215686512369453 |
| 15 | 30416741529792514761403 |
| 16 | 35496321045754012369453 |
| 17 | 3041674104186814014761403 |