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 | 0 |
| 1 | 1 |
| 2 | -7 |
| 3 | 183 |
| 4 | -14639 |
| 5 | 3542639 |
| 6 | -2579041191 |
| 7 | 5637784043527 |
| 8 | -36983863325537119 |
| 9 | 727916397973221576159 |
| 10 | -42982007467522787629036631 |
| 11 | 7614090694841791737333323035127 |
| 12 | -4046432358866721800888421193787892879 |