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 | 33 |
| 3 | -723 |
| 4 | 25953 |
| 5 | -1376643 |
| 6 | 101031873 |
| 7 | -9795436563 |
| 8 | 1212135593793 |
| 9 | -186388033956483 |
| 10 | 34859622790687713 |
| 11 | -7791941518975112403 |
| 12 | 2051293521728340489633 |
| 13 | -628173356956461494680323 |
| 14 | 221398076445213367209575553 |
| 15 | -88980467736394156270609236243 |
| 16 | 40450409313733718675802456121473 |