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 | 1 |
| 1 | 3 |
| 2 | 9 |
| 3 | 19 |
| 4 | 65 |
| 5 | 75 |
| 6 | 385 |
| 7 | 531 |
| 8 | 1545 |
| 9 | 2115 |
| 10 | 10241 |
| 11 | 8283 |
| 12 | 49153 |
| 13 | 49539 |
| 14 | 131145 |
| 15 | 262675 |
| 16 | 1048577 |
| 17 | 788043 |
| 18 | 4718593 |
| 19 | 4196435 |
| 20 | 12583305 |
| 21 | 20981763 |
| 22 | 92274689 |
| 23 | 67117659 |
| 24 | 335544385 |
| 25 | 402702339 |
| 26 | 1207961097 |
| 27 | 1610662291 |
| 28 | 7516192769 |
| 29 | 4295100555 |