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 | 1 |
| 2 | 7 |
| 3 | 61 |
| 4 | 619 |
| 5 | 7045 |
| 6 | 87955 |
| 7 | 1187845 |
| 8 | 17192275 |
| 9 | 264940405 |
| 10 | 4326439075 |
| 11 | 74593075525 |
| 12 | 1353928981075 |
| 13 | 25809901069525 |
| 14 | 515683999204675 |
| 15 | 10779677853137125 |
| 16 | 235366439343773875 |
| 17 | 5359766538695291125 |