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 | 0 |
| 1 | 1 |
| 2 | 43 |
| 3 | 1807 |
| 4 | 75895 |
| 5 | 3187591 |
| 6 | 133878823 |
| 7 | 5622910567 |
| 8 | 236162243815 |
| 9 | 9918814240231 |
| 10 | 416590198089703 |
| 11 | 17496788319767527 |
| 12 | 734865109430236135 |
| 13 | 30864334596069917671 |
| 14 | 1296302053034936542183 |
| 15 | 54444686227467334771687 |
| 16 | 2286676821553628060410855 |
| 17 | 96040426505252378537255911 |