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 | 5 |
| 2 | 15 |
| 3 | 15 |
| 4 | 45 |
| 5 | 175 |
| 6 | 45 |
| 7 | 165 |
| 8 | 2635 |
| 9 | 2635 |
| 10 | 165 |
| 11 | 629 |
| 12 | 49075 |
| 13 | 217125 |
| 14 | 49075 |
| 15 | 629 |
| 16 | 2635 |
| 17 | 976887 |
| 18 | 20346485 |
| 19 | 20346485 |
| 20 | 976887 |
| 21 | 2635 |
| 22 | 11165 |
| 23 | 20349075 |
| 24 | 2034505661 |
| 25 | 9536816875 |
| 26 | 2034505661 |
| 27 | 20349075 |
| 28 | 11165 |
| 29 | 48915 |
| 30 | 435970995 |
| 31 | 211927741375 |