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 | 3 |
| 2 | 9 |
| 3 | 81 |
| 4 | 972 |
| 5 | 14580 |
| 6 | 262440 |
| 7 | 5511240 |
| 8 | 132269760 |
| 9 | 3571283520 |
| 10 | 107138505600 |
| 11 | 3535570684800 |
| 12 | 127280544652800 |
| 13 | 4963941241459200 |
| 14 | 208485532141286400 |
| 15 | 9381848946357888000 |
| 16 | 450328749425178624000 |