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 | 1 |
| 2 | -127 |
| 3 | -383 |
| 4 | 48385 |
| 5 | 244481 |
| 6 | -30721919 |
| 7 | -218483327 |
| 8 | 27308356097 |
| 9 | 251035282945 |
| 10 | -31208190940799 |
| 11 | -352533353110399 |
| 12 | 43588599491534593 |
| 13 | 585079829869107457 |
| 14 | -71946349724044455295 |
| 15 | -1120409404849485018239 |
| 16 | 137016582065315869148161 |