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 | 13 |
| 3 | 684 |
| 4 | 73980 |
| 5 | 13376448 |
| 6 | 3627115200 |
| 7 | 1376014521600 |
| 8 | 695592156268800 |
| 9 | 451867517982720000 |
| 10 | 366777996951376281600 |
| 11 | 363753784968105369600000 |
| 12 | 432795572570448228556800000 |
| 13 | 608442975450529801872998400000 |
| 14 | 997771862620790990336507904000000 |