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 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 4 |
| 6 | 16 |
| 7 | 81 |
| 8 | 529 |
| 9 | 4225 |
| 10 | 38025 |
| 11 | 379456 |
| 12 | 4173849 |
| 13 | 50083929 |
| 14 | 651066256 |
| 15 | 9114902784 |
| 16 | 136723197121 |
| 17 | 2187571153936 |
| 18 | 37188701848516 |
| 19 | 669396605290000 |
| 20 | 12718535343402256 |
| 21 | 254370705884725824 |
| 22 | 5341784820136403409 |