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 | 2 |
| 2 | 3 |
| 3 | 8 |
| 4 | 32 |
| 5 | 160 |
| 6 | 960 |
| 7 | 6720 |
| 8 | 53760 |
| 9 | 483840 |
| 10 | 4838400 |
| 11 | 53222400 |
| 12 | 638668800 |
| 13 | 8302694400 |
| 14 | 116237721600 |
| 15 | 1743565824000 |
| 16 | 27897053184000 |
| 17 | 474249904128000 |
| 18 | 8536498274304000 |
| 19 | 162193467211776000 |
| 20 | 3243869344235520000 |