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 | 0 |
| 1 | 8 |
| 2 | 96 |
| 3 | 768 |
| 4 | 5120 |
| 5 | 30720 |
| 6 | 172032 |
| 7 | 917504 |
| 8 | 4718592 |
| 9 | 23592960 |
| 10 | 115343360 |
| 11 | 553648128 |
| 12 | 2617245696 |
| 13 | 12213813248 |
| 14 | 56371445760 |
| 15 | 257698037760 |
| 16 | 1168231104512 |
| 17 | 5257039970304 |
| 18 | 23502061043712 |
| 19 | 104453604638720 |
| 20 | 461794883665920 |