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 | 2304 |
| 3 | 367500 |
| 4 | 42467328 |
| 5 | 4381392020 |
| 6 | 428652000000 |
| 7 | 40643137651228 |
| 8 | 3771854305099776 |
| 9 | 344499209234302500 |
| 10 | 31074298464967845120 |
| 11 | 2774871814779003772844 |
| 12 | 245741556726521856000000 |
| 13 | 21611621448116558812137652 |
| 14 | 1889376666754339457990201088 |
| 15 | 164334311374716912516773437500 |