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 | -5 |
| 2 | 67 |
| 3 | -1013 |
| 4 | 17131 |
| 5 | -309461 |
| 6 | 5849131 |
| 7 | -114243413 |
| 8 | 2287607467 |
| 9 | -46710150485 |
| 10 | 968879741611 |
| 11 | -20358507992405 |
| 12 | 432438339283627 |
| 13 | -9270351245202773 |
| 14 | 200309903779703467 |
| 15 | -4358060643012007253 |
| 16 | 95389812498547780267 |
| 17 | -2099063396615767545173 |