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 | 1 |
| 5 | 2 |
| 6 | 2 |
| 7 | 6 |
| 8 | 12 |
| 9 | 24 |
| 10 | 48 |
| 11 | 720 |
| 12 | 240 |
| 13 | 2160 |
| 14 | 23040 |
| 15 | 45360 |
| 16 | 40320 |
| 17 | 2419200 |
| 18 | 1935360 |
| 19 | 65318400 |
| 20 | 69672960 |
| 21 | 163296000 |
| 22 | 2786918400 |
| 23 | 754427520000 |
| 24 | 22992076800 |
| 25 | 201180672000 |
| 26 | 14714929152000 |
| 27 | 211843247616000 |
| 28 | 114776447385600 |
| 29 | 32953394073600000 |
| 30 | 2410305395097600 |