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 | 24 |
| 3 | 120 |
| 4 | 600 |
| 5 | 3000 |
| 6 | 15000 |
| 7 | 75000 |
| 8 | 375000 |
| 9 | 1875000 |
| 10 | 9375000 |
| 11 | 46875000 |
| 12 | 234375000 |
| 13 | 1171875000 |
| 14 | 5859375000 |
| 15 | 29296875000 |
| 16 | 146484375000 |
| 17 | 732421875000 |
| 18 | 3662109375000 |
| 19 | 18310546875000 |
| 20 | 91552734375000 |
| 21 | 457763671875000 |
| 22 | 2288818359375000 |
| 23 | 11444091796875000 |