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 | 10 |
| 2 | 350 |
| 3 | 1050 |
| 4 | 57750 |
| 5 | 250250 |
| 6 | 2388750 |
| 7 | 2231250 |
| 8 | 1088106250 |
| 9 | 137156250 |
| 10 | 105761906250 |
| 11 | 2289218750 |
| 12 | 8842968750 |
| 13 | 51289218750 |
| 14 | 45049030468750 |
| 15 | 3563716406250 |
| 16 | 1099667378906250 |
| 17 | 4714260332031250 |
| 18 | 14142780996093750 |