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 | 77805 |
| 7 | 161595 |
| 8 | 331695 |
| 9 | 575025 |
| 10 | 664335 |
| 11 | 765765 |
| 12 | 1601145 |
| 13 | 2250885 |
| 14 | 2380833 |
| 15 | 2690415 |
| 16 | 3271905 |
| 17 | 3828825 |
| 18 | 4107285 |
| 19 | 5181813 |
| 20 | 5778045 |
| 21 | 5871285 |
| 22 | 6007365 |
| 23 | 6613425 |
| 24 | 7448805 |
| 25 | 9258795 |
| 26 | 9787869 |
| 27 | 9935055 |
| 28 | 10503675 |
| 29 | 10554705 |
| 30 | 10724805 |
| 31 | 11060595 |