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 | 5 |
| 2 | 35 |
| 3 | 305 |
| 4 | 3155 |
| 5 | 37625 |
| 6 | 507035 |
| 7 | 7608305 |
| 8 | 125687555 |
| 9 | 2265230825 |
| 10 | 44210200235 |
| 11 | 928594230305 |
| 12 | 20880079975955 |
| 13 | 500343586672025 |
| 14 | 12726718227077435 |
| 15 | 342425052939060305 |
| 16 | 9715738272696568355 |
| 17 | 289901469137229041225 |
| 18 | 9074304882434034258635 |
| 19 | 297297854264669632338305 |