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 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 9 |
| 4 | 125 |
| 5 | 1409 |
| 6 | 134649 |
| 7 | 9775233 |
| 8 | 7056026001 |
| 9 | 4365949239297 |
| 10 | 25236968856946209 |
| 11 | 97871747641444333569 |
| 12 | 6214784730407041487304385 |
| 13 | 252021162589018039813851873281 |
| 14 | 105775796091843258520649528395263873 |
| 15 | 37978893525907253948045960222247183810561 |