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 | 1 |
| 3 | 7 |
| 4 | 93 |
| 5 | 1856 |
| 6 | 49753 |
| 7 | 1679441 |
| 8 | 68463769 |
| 9 | 3273695758 |
| 10 | 179710285011 |
| 11 | 11141016392749 |
| 12 | 769939840667473 |
| 13 | 58695964339179805 |
| 14 | 4893452980658819151 |
| 15 | 442915168219228586581 |
| 16 | 43255083632741702266097 |
| 17 | 4533695508041747494704359 |
| 18 | 507638249638364368312476913 |