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 | 21 |
| 2 | 343 |
| 3 | 5145 |
| 4 | 74431 |
| 5 | 1058841 |
| 6 | 14941423 |
| 7 | 210003465 |
| 8 | 2945813311 |
| 9 | 41281739961 |
| 10 | 578226834703 |
| 11 | 8097153012585 |
| 12 | 113373983463391 |
| 13 | 1587332657497881 |
| 14 | 22223335428043183 |
| 15 | 311131443554114505 |