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 | 0 |
| 2 | 32 |
| 3 | 128 |
| 4 | 1536 |
| 5 | 10240 |
| 6 | 90112 |
| 7 | 688128 |
| 8 | 5636096 |
| 9 | 44564480 |
| 10 | 358612992 |
| 11 | 2860515328 |
| 12 | 22917677056 |
| 13 | 183207198720 |
| 14 | 1466194460672 |
| 15 | 11727408201728 |
| 16 | 93827855548416 |
| 17 | 750588484648960 |
| 18 | 6004845316145152 |
| 19 | 48038212773347328 |