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 | 45 |
| 2 | 525 |
| 3 | 2205 |
| 4 | 31185 |
| 5 | 99099 |
| 6 | 585585 |
| 7 | 1640925 |
| 8 | 35334585 |
| 9 | 92147055 |
| 10 | 468495027 |
| 11 | 1166167275 |
| 12 | 11408158125 |
| 13 | 27484885575 |
| 14 | 130734984825 |
| 15 | 307452619485 |
| 16 | 11455089532425 |
| 17 | 26442675480375 |
| 18 | 121132637200575 |
| 19 | 275520749478975 |