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 | 3 |
| 1 | 5 |
| 2 | 13 |
| 3 | 17 |
| 4 | 241 |
| 5 | 257 |
| 6 | 65281 |
| 7 | 65537 |
| 8 | 4294901761 |
| 9 | 4294967297 |
| 10 | 18446744069414584321 |
| 11 | 18446744073709551617 |
| 12 | 340282366920938463444927863358058659841 |