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 | 15 |
| 4 | 255 |
| 5 | 65535 |
| 6 | 2200694 |
| 7 | 2619705 |
| 8 | 6372794 |
| 9 | 40588485 |
| 10 | 76466985 |
| 11 | 81591194 |
| 12 | 118018094 |
| 13 | 206569605 |
| 14 | 470542485 |
| 15 | 525644385 |
| 16 | 726638834 |
| 17 | 791937614 |
| 18 | 971122514 |
| 19 | 991172805 |