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 | 2 |
| 3 | 6 |
| 4 | 6 |
| 5 | 30 |
| 6 | 15 |
| 7 | 105 |
| 8 | 105 |
| 9 | 105 |
| 10 | 210 |
| 11 | 2310 |
| 12 | 2310 |
| 13 | 30030 |
| 14 | 15015 |
| 15 | 5005 |
| 16 | 5005 |
| 17 | 85085 |
| 18 | 85085 |
| 19 | 1616615 |
| 20 | 1616615 |
| 21 | 4849845 |
| 22 | 9699690 |
| 23 | 223092870 |
| 24 | 223092870 |
| 25 | 223092870 |
| 26 | 111546435 |
| 27 | 111546435 |
| 28 | 111546435 |
| 29 | 3234846615 |
| 30 | 2156564410 |
| 31 | 66853496710 |