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 | 3 |
| 3 | 12 |
| 4 | 32 |
| 5 | -625 |
| 6 | -24624 |
| 7 | -705894 |
| 8 | -19922944 |
| 9 | -588305187 |
| 10 | -18500000000 |
| 11 | -622498190424 |
| 12 | -22414085849088 |
| 13 | -862029149531797 |
| 14 | -35320307409809408 |
| 15 | -1537494104003906250 |
| 16 | -70904672533321089024 |
| 17 | -3454944623172347662151 |
| 18 | -177423154932124201844736 |