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 | 23 |
| 2 | 1007 |
| 3 | 7983359 |
| 4 | 1245404159 |
| 5 | 71137485619199 |
| 6 | 24329020081766399 |
| 7 | 5170403347776995327999 |
| 8 | 1768352398747940390908723199999 |
| 9 | 1644567730835584563545112575999999 |