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 | -2 |
| 2 | -33 |
| 3 | 131 |
| 4 | 7557 |
| 5 | -52441 |
| 6 | -4479453 |
| 7 | 43772651 |
| 8 | 4978712937 |
| 9 | -62592982321 |
| 10 | -8897903159673 |
| 11 | 136734572412371 |
| 12 | 23324631240713517 |
| 13 | -423603623547304201 |
| 14 | -84302829345075000693 |
| 15 | 1766588227683291263291 |
| 16 | 401799765855712694217297 |
| 17 | -9542464808808332243626081 |