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 | 27 |
| 3 | 864 |
| 4 | 36000 |
| 5 | 1944000 |
| 6 | 133358400 |
| 7 | 11379916800 |
| 8 | 1185137049600 |
| 9 | 148142131200000 |
| 10 | 21908575180800000 |
| 11 | 3785801791242240000 |
| 12 | 756127866850836480000 |
| 13 | 172901238886557941760000 |
| 14 | 44887821634010234880000000 |
| 15 | 13132894100921851576320000000 |
| 16 | 4301460581188603786297344000000 |