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 | 2 |
| 3 | 3 |
| 4 | 10 |
| 5 | 25 |
| 6 | 161 |
| 7 | 721 |
| 8 | 5706 |
| 9 | 40881 |
| 10 | 385687 |
| 11 | 3628801 |
| 12 | 41268613 |
| 13 | 479001601 |
| 14 | 6324319717 |
| 15 | 87212177053 |
| 16 | 1317906346186 |
| 17 | 20922789888001 |
| 18 | 357099708702023 |
| 19 | 6402373705728001 |
| 20 | 121882752536893635 |
| 21 | 2432928081076384321 |
| 22 | 51140835669924352717 |