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 | 3 |
| 2 | 75 |
| 3 | 1323 |
| 4 | 21675 |
| 5 | 348843 |
| 6 | 5589675 |
| 7 | 89467563 |
| 8 | 1431612075 |
| 9 | 22906317483 |
| 10 | 366503176875 |
| 11 | 5864059218603 |
| 12 | 93824981052075 |
| 13 | 1501199831050923 |
| 14 | 24019197833685675 |
| 15 | 384307167486454443 |
| 16 | 6148914688373205675 |
| 17 | 98382635048331029163 |
| 18 | 1574122160910735420075 |
| 19 | 25185954575121522535083 |