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 | 5 |
| 4 | 101 |
| 5 | 3417 |
| 6 | 184881 |
| 7 | 14216101 |
| 8 | 1477674733 |
| 9 | 199405047857 |
| 10 | 33889007175041 |
| 11 | 7081268215880805 |
| 12 | 1784184251089927605 |