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 | 18 |
| 3 | 600 |
| 4 | 35280 |
| 5 | 3265920 |
| 6 | 439084800 |
| 7 | 80951270400 |
| 8 | 19615115520000 |
| 9 | 6046686277632000 |
| 10 | 2311256907767808000 |
| 11 | 1072909785605898240000 |
| 12 | 594596384994354462720000 |
| 13 | 387780251083274649600000000 |
| 14 | 293999475161295508340736000000 |
| 15 | 256411097818451356681764864000000 |