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 | 2 |
| 2 | 5 |
| 3 | 25 |
| 4 | 157 |
| 5 | 1325 |
| 6 | 14358 |
| 7 | 199763 |
| 8 | 3549001 |
| 9 | 80673244 |
| 10 | 2352747542 |
| 11 | 88240542454 |
| 12 | 4261209044877 |
| 13 | 264988507673267 |
| 14 | 21207485269909946 |
| 15 | 2182146922863398203 |