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 | 2 |
| 2 | 6 |
| 3 | 12 |
| 4 | 60 |
| 5 | 180 |
| 6 | 1260 |
| 7 | 2520 |
| 8 | 27720 |
| 9 | 83160 |
| 10 | 1081080 |
| 11 | 3603600 |
| 12 | 61261200 |
| 13 | 698377680 |
| 14 | 3491888400 |
| 15 | 80313433200 |
| 16 | 240940299600 |
| 17 | 1686582097200 |
| 18 | 48910880818800 |
| 19 | 1516237305382800 |
| 20 | 3032474610765600 |
| 21 | 112201560598327200 |
| 22 | 3066842656354276800 |
| 23 | 131874234223233902400 |
| 24 | 659371171116169512000 |
| 25 | 30990445042459967064000 |