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 | 2 |
| 1 | 4 |
| 2 | 24 |
| 3 | 288 |
| 4 | 5760 |
| 5 | 172800 |
| 6 | 7257600 |
| 7 | 406425600 |
| 8 | 29262643200 |
| 9 | 2633637888000 |
| 10 | 289700167680000 |
| 11 | 38240422133760000 |
| 12 | 5965505852866560000 |
| 13 | 1085722065221713920000 |
| 14 | 228001633696559923200000 |
| 15 | 54720392087174381568000000 |
| 16 | 14883946647711431786496000000 |