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) |
|---|---|
| 2 | 10 |
| 3 | 72 |
| 4 | 448 |
| 5 | 2560 |
| 6 | 13824 |
| 7 | 71680 |
| 8 | 360448 |
| 9 | 1769472 |
| 10 | 8519680 |
| 11 | 40370176 |
| 12 | 188743680 |
| 13 | 872415232 |
| 14 | 3992977408 |
| 15 | 18119393280 |
| 16 | 81604378624 |
| 17 | 365072220160 |
| 18 | 1623497637888 |
| 19 | 7181185318912 |
| 20 | 31610959298560 |
| 21 | 138538465099776 |
| 22 | 604731395276800 |
| 23 | 2630031813640192 |