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 | 104 |
| 3 | 920 |
| 4 | 7682 |
| 5 | 61574 |
| 6 | 490760 |
| 7 | 3929027 |
| 8 | 31501117 |
| 9 | 252454167 |
| 10 | 2022844426 |
| 11 | 16209670759 |
| 12 | 129896538285 |
| 13 | 1040912909763 |
| 14 | 8341204621591 |
| 15 | 66841228911422 |
| 16 | 535624801555647 |
| 17 | 4292168448581044 |
| 18 | 34394795269925139 |
| 19 | 275618732897288063 |