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 | 4 |
| 2 | 6 |
| 3 | 24 |
| 4 | 120 |
| 5 | 480 |
| 6 | 2016 |
| 7 | 8064 |
| 8 | 32640 |
| 9 | 130560 |
| 10 | 523776 |
| 11 | 2095104 |
| 12 | 8386560 |
| 13 | 33546240 |
| 14 | 134209536 |
| 15 | 536838144 |
| 16 | 2147450880 |
| 17 | 8589803520 |
| 18 | 34359607296 |
| 19 | 137438429184 |
| 20 | 549755289600 |
| 21 | 2199021158400 |
| 22 | 8796090925056 |
| 23 | 35184363700224 |
| 24 | 140737479966720 |
| 25 | 562949919866880 |