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 | 1 |
| 2 | 3 |
| 3 | 13 |
| 4 | 81 |
| 5 | 721 |
| 6 | 9153 |
| 7 | 165313 |
| 8 | 4244481 |
| 9 | 154732801 |
| 10 | 8005686273 |
| 11 | 587435092993 |
| 12 | 61116916981761 |
| 13 | 9011561121239041 |
| 14 | 1882834327457349633 |
| 15 | 557257804202631217153 |
| 16 | 233610656002563147038721 |
| 17 | 138681207656726645785559041 |