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 | 12 |
| 2 | 24 |
| 3 | 84 |
| 4 | 120 |
| 5 | 672 |
| 6 | 24384 |
| 7 | 43065 |
| 8 | 78975 |
| 9 | 81081 |
| 10 | 261261 |
| 11 | 523776 |
| 12 | 9124731 |
| 13 | 13398021 |
| 14 | 69087249 |
| 15 | 91963648 |
| 16 | 459818240 |
| 17 | 39142675143 |
| 18 | 51001180160 |