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 | 10 |
| 2 | -1822 |
| 3 | -56660 |
| 4 | 9939052 |
| 5 | 534992600 |
| 6 | -90164363720 |
| 7 | -7071178300400 |
| 8 | 1142359566484880 |
| 9 | 120150033211799200 |
| 10 | -18559035448937462240 |
| 11 | -2494873992820155246400 |
| 12 | 367426387533234274214080 |
| 13 | 61216037645736403345110400 |
| 14 | -8568355342448027542061898880 |