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) |
|---|---|
| 7 | 1 |
| 8 | 16 |
| 9 | 288 |
| 10 | 5280 |
| 11 | 101640 |
| 12 | 2068704 |
| 13 | 44595408 |
| 14 | 1017804216 |
| 15 | 24559319070 |
| 16 | 625388375040 |
| 17 | 16772475939648 |
| 18 | 472802783660064 |
| 19 | 13981054231585584 |
| 20 | 432866241024085440 |
| 21 | 14006847775868101440 |
| 22 | 472893544571144089536 |
| 23 | 16631451859811919417144 |
| 24 | 608402197372214335559040 |