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 | 1 |
| 2 | 3 |
| 3 | 17 |
| 4 | 155 |
| 5 | 2025 |
| 6 | 34819 |
| 7 | 743329 |
| 8 | 18937707 |
| 9 | 560071193 |
| 10 | 18844479635 |
| 11 | 710440531665 |
| 12 | 29654234779771 |
| 13 | 1357326276747721 |
| 14 | 67589738142784803 |
| 15 | 3637403230889380097 |
| 16 | 210358430818676801675 |
| 17 | 13009719599952748481145 |