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 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 16 |
| 6 | 64 |
| 7 | 384 |
| 8 | 3072 |
| 9 | 36864 |
| 10 | 589824 |
| 11 | 5898240 |
| 12 | 188743680 |
| 13 | 2264924160 |
| 14 | 81537269760 |
| 15 | 5218385264640 |
| 16 | 333976656936960 |
| 17 | 5343626510991360 |
| 18 | 769482217582755840 |
| 19 | 13850679916489605120 |
| 20 | 3545774058621338910720 |
| 21 | 510591464441472803143680 |
| 22 | 51059146444147280314368000 |