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 | 13 |
| 3 | 273 |
| 4 | 7917 |
| 5 | 292929 |
| 6 | 13181805 |
| 7 | 698635665 |
| 8 | 42616775565 |
| 9 | 2940557513985 |
| 10 | 226422928576845 |
| 11 | 19245948929031825 |
| 12 | 1789873250399959725 |
| 13 | 180777198290395932225 |
| 14 | 19704714613653156612525 |
| 15 | 2305451609797419323665425 |
| 16 | 288181451224677415458178125 |
| 17 | 38328133012882096255937690625 |