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 | 2 |
| 2 | 8 |
| 3 | 60 |
| 4 | 192 |
| 5 | 1400 |
| 6 | 4320 |
| 7 | 39060 |
| 8 | 119808 |
| 9 | 894240 |
| 10 | 2912000 |
| 11 | 24414060 |
| 12 | 62208000 |
| 13 | 610351560 |
| 14 | 1959874560 |
| 15 | 13154400000 |
| 16 | 44043337728 |
| 17 | 380537036928 |
| 18 | 997843069440 |
| 19 | 9485297382000 |
| 20 | 25606963200000 |
| 21 | 230106651919200 |
| 22 | 748687423334400 |
| 23 | 5959800062798400 |
| 24 | 15138938880000000 |