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 | 2 |
| 2 | 12 |
| 3 | 64 |
| 4 | 672 |
| 5 | 8448 |
| 6 | 138240 |
| 7 | 2672640 |
| 8 | 60641280 |
| 9 | 1568931840 |
| 10 | 45705461760 |
| 11 | 1478924697600 |
| 12 | 52646746521600 |
| 13 | 2044394156851200 |
| 14 | 86005817907609600 |
| 15 | 3896481847600742400 |
| 16 | 189139342470414336000 |
| 17 | 9793081532749971456000 |
| 18 | 538748376721309827072000 |
| 19 | 31381673358053118836736000 |