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 | 7 |
| 4 | 15 |
| 5 | 15 |
| 6 | 21 |
| 7 | 15 |
| 8 | 39 |
| 9 | 91 |
| 10 | 555 |
| 11 | 285 |
| 12 | 915 |
| 13 | 3333 |
| 14 | 1155 |
| 15 | 1267 |
| 16 | 2769 |
| 17 | 4935 |
| 18 | 10005 |
| 19 | 70635 |
| 20 | 7035 |
| 21 | 240045 |
| 22 | 77745 |
| 23 | 167055 |
| 24 | 897429 |
| 25 | 1231635 |
| 26 | 1066065 |
| 27 | 1174695 |