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 | 9 |
| 2 | 404 |
| 3 | 1441 |
| 4 | 7227 |
| 5 | 20802 |
| 6 | 73337 |
| 7 | 2576752 |
| 8 | 7576757 |
| 9 | 144666441 |
| 10 | 7584554857 |
| 11 | 96520502569 |
| 12 | 3584243424853 |
| 13 | 3776886886773 |
| 14 | 6651010101566 |
| 15 | 9260919190629 |
| 16 | 36028948184982063 |
| 17 | 4095836722276385904 |
| 18 | 8806146443446416088 |
| 19 | 66832347055074323866 |
| 20 | 331143864040468341133 |
| 21 | 719190811555118091917 |
| 22 | 906041488626884140609 |
| 23 | 10450905369496350905401 |