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) |
|---|---|
| 0 | 1 |
| 1 | 72 |
| 2 | 4824 |
| 3 | 316736 |
| 4 | 20614104 |
| 5 | 1335305664 |
| 6 | 86248451520 |
| 7 | 5560325134848 |
| 8 | 357992555533272 |
| 9 | 23026456586057408 |
| 10 | 1479999826835627328 |
| 11 | 95071036081670530560 |
| 12 | 6104320340924619384256 |
| 13 | 391801560518407856592384 |