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 | 2 |
| 5 | 3 |
| 6 | 5 |
| 7 | 16 |
| 8 | 63 |
| 9 | 395 |
| 10 | 7328 |
| 11 | 486549 |
| 12 | 195081415 |
| 13 | 1433122040192 |
| 14 | 697379012200764243 |
| 15 | 136045964066902820948075525 |
| 16 | 194970470582876525091946983913863955456 |