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) |
|---|---|
| 0 | 15 |
| 1 | 403 |
| 2 | 31031 |
| 3 | 3543517 |
| 4 | 464378915 |
| 5 | 64178802493 |
| 6 | 9070067614091 |
| 7 | 1294620020196997 |
| 8 | 185637589303481315 |
| 9 | 26676789058694821933 |
| 10 | 3837572548050547502651 |
| 11 | 552334249790915518944277 |
| 12 | 79516409977044969123349715 |