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 | 1 |
| 2 | 1 |
| 3 | 6 |
| 4 | 96 |
| 5 | 3000 |
| 6 | 155520 |
| 7 | 12101040 |
| 8 | 1321205760 |
| 9 | 192849310080 |
| 10 | 36288000000000 |
| 11 | 8556520581100800 |
| 12 | 2471543044256563200 |
| 13 | 858447696200353459200 |
| 14 | 353034171594345598156800 |
| 15 | 169665960401437500000000000 |