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 | 1 |
| 2 | 8 |
| 3 | 190 |
| 4 | 9080 |
| 5 | 725320 |
| 6 | 87067520 |
| 7 | 14652451360 |
| 8 | 3291452374400 |
| 9 | 951504315644800 |
| 10 | 344097665398707200 |
| 11 | 152191547632887731200 |
| 12 | 80821740082953347993600 |
| 13 | 50749489515964112842240000 |
| 14 | 37193794460546391363092480000 |
| 15 | 31464706192542487393274091520000 |