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 | 32 |
| 2 | 528 |
| 3 | 6016 |
| 4 | 53384 |
| 5 | 393920 |
| 6 | 2517824 |
| 7 | 14329600 |
| 8 | 74059812 |
| 9 | 352722720 |
| 10 | 1565583648 |
| 11 | 6533812352 |
| 12 | 25823152256 |
| 13 | 97218393280 |
| 14 | 350348856704 |
| 15 | 1213526698240 |
| 16 | 4054279504266 |
| 17 | 13103911398400 |
| 18 | 41081428394096 |
| 19 | 125210147216000 |
| 20 | 371754750363712 |
| 21 | 1077136199182976 |
| 22 | 3050503922469440 |