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 | 3 |
| 2 | 7 |
| 3 | 13 |
| 4 | 61 |
| 5 | 2521 |
| 6 | 55441 |
| 7 | 4324321 |
| 8 | 367567201 |
| 9 | 6064949221531201 |
| 10 | 9200527969062830401 |
| 11 | 37188534050951960476801 |
| 12 | 8201519488959040182625924708238885435575055666675808001 |