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 | 192 |
| 2 | -8928 |
| 3 | 9984 |
| 4 | 1420896 |
| 5 | 11433600 |
| 6 | 53760384 |
| 7 | 187233792 |
| 8 | 533725920 |
| 9 | 1327018944 |
| 10 | 2953851840 |
| 11 | 6060858624 |
| 12 | 11611915392 |
| 13 | 21030301824 |
| 14 | 36387585792 |
| 15 | 60357358080 |
| 16 | 97020376032 |
| 17 | 150755202432 |
| 18 | 229107724704 |
| 19 | 338493223680 |
| 20 | 492378465600 |
| 21 | 698632525824 |
| 22 | 980953593984 |