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 | 2 |
| 2 | 2 |
| 3 | 3 |
| 4 | 13 |
| 5 | 59 |
| 6 | 65521 |
| 7 | 262127 |
| 8 | 18014398509481931 |
| 9 | 288230376151711687 |
| 10 | 1267650600228229401496703205277 |
| 11 | 1329227995784915872903807060280344457 |