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 | 6 |
| 4 | 12 |
| 5 | 60 |
| 6 | 360 |
| 7 | 1260 |
| 8 | 2520 |
| 9 | 27720 |
| 10 | 138600 |
| 11 | 360360 |
| 12 | 831600 |
| 13 | 10810800 |
| 14 | 75675600 |
| 15 | 183783600 |
| 16 | 1286485200 |
| 17 | 24443218800 |
| 18 | 38594556000 |
| 19 | 424540116000 |
| 20 | 733296564000 |
| 21 | 8066262204000 |
| 22 | 185524030692000 |
| 23 | 1693915062840000 |
| 24 | 5380196890068000 |
| 25 | 38960046445320000 |
| 26 | 166786103592108000 |