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) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 2 |
| 5 | 1 |
| 6 | 3 |
| 7 | 7 |
| 8 | 12 |
| 9 | 12 |
| 10 | 1 |
| 11 | 4 |
| 12 | 16 |
| 13 | 68 |
| 14 | 292 |
| 15 | 1120 |
| 16 | 3360 |
| 17 | 6720 |
| 18 | 6720 |
| 19 | 1 |
| 20 | 5 |
| 21 | 30 |
| 22 | 235 |
| 23 | 2251 |
| 24 | 23520 |
| 25 | 245280 |
| 26 | 2412480 |
| 27 | 21631680 |
| 28 | 172972800 |
| 29 | 1210809600 |
| 30 | 7264857600 |
| 31 | 36324288000 |
| 32 | 145297152000 |
| 33 | 435891456000 |
| 34 | 871782912000 |
| 35 | 871782912000 |