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 | 3 |
| 3 | 15 |
| 4 | 20 |
| 5 | 51 |
| 6 | 68 |
| 7 | 255 |
| 8 | 340 |
| 9 | 771 |
| 10 | 1028 |
| 11 | 3855 |
| 12 | 5140 |
| 13 | 13107 |
| 14 | 17476 |
| 15 | 65535 |
| 16 | 87380 |
| 17 | 196611 |
| 18 | 262148 |
| 19 | 983055 |