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 | 3 |
| 3 | 1 |
| 4 | 33 |
| 5 | 5 |
| 6 | 75 |
| 7 | 611 |
| 8 | 97653 |
| 9 | 83057 |
| 10 | 22018179 |
| 11 | 9625216 |
| 12 | 20894487717 |
| 13 | 93120706729 |
| 14 | 411117020063871 |
| 15 | 297434062421057 |
| 16 | 6650181371241300777 |
| 17 | 6082551300359191981 |
| 18 | 2198073713661546055399083 |
| 19 | 53388901948383223161199 |
| 20 | 31122898898234908646386438959 |