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 | 5 |
| 4 | 24 |
| 5 | 48 |
| 6 | 32 |
| 7 | 100 |
| 8 | 140 |
| 9 | 840 |
| 10 | 1872 |
| 11 | 54000 |
| 12 | 12960 |
| 13 | 51840 |
| 14 | 533871 |
| 15 | 322371 |
| 16 | 31104 |
| 17 | 709632 |
| 18 | 1921500 |
| 19 | 4147200 |
| 20 | 3701376 |
| 21 | 124416 |
| 22 | 262080 |
| 23 | 2488320 |
| 24 | 21811680 |
| 25 | 403107840 |
| 26 | 146966400 |
| 27 | 2538086400 |
| 28 | 1074954240 |
| 29 | 14370048000 |
| 30 | 415704960000 |