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 | 3 |
| 3 | 5 |
| 4 | 17 |
| 5 | 217 |
| 6 | 257 |
| 7 | 387 |
| 8 | 8209 |
| 9 | 20137 |
| 10 | 37025 |
| 11 | 59141 |
| 12 | 65537 |
| 13 | 283801 |
| 14 | 649801 |
| 15 | 1382401 |
| 16 | 373164545 |
| 17 | 535019101 |
| 18 | 2453039425 |
| 19 | 4294967297 |