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 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 64 |
| 5 | 2998 |
| 6 | 456649 |
| 7 | 209156119 |
| 8 | 280782187131 |
| 9 | 1114340919987573 |
| 10 | 12994612967873847001 |
| 11 | 446094799302794492462850 |