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 | -3 |
| 2 | -187 |
| 3 | 1737 |
| 4 | 181577 |
| 5 | -2828523 |
| 6 | -433608307 |
| 7 | 9464818017 |
| 8 | 1929308914577 |
| 9 | -54151301196243 |
| 10 | -13793410821936427 |
| 11 | 473188884804949497 |
| 12 | 144631586163051804377 |
| 13 | -5863775132075093720763 |
| 14 | -2090985354124427263262947 |
| 15 | 97816726792847265070764177 |
| 16 | 39863788048903869672547506977 |