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 | 1 |
| 3 | 1 |
| 4 | 3 |
| 5 | 6 |
| 6 | 5 |
| 7 | 30 |
| 8 | 105 |
| 9 | 140 |
| 10 | 126 |
| 11 | 1260 |
| 12 | 1155 |
| 13 | 13860 |
| 14 | 12870 |
| 15 | 12012 |
| 16 | 9009 |
| 17 | 72072 |
| 18 | 68068 |
| 19 | 1225224 |
| 20 | 5819814 |
| 21 | 5542680 |
| 22 | 5290740 |
| 23 | 116396280 |
| 24 | 111546435 |
| 25 | 535422888 |
| 26 | 514829700 |
| 27 | 1487285800 |
| 28 | 1434168450 |
| 29 | 5736673800 |
| 30 | 5545451340 |
| 31 | 166363540200 |
| 32 | 644658718275 |
| 33 | 312561802800 |