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 | -7 |
| 2 | -51 |
| 3 | 1757 |
| 4 | 23001 |
| 5 | -1423807 |
| 6 | -27733851 |
| 7 | 2423221157 |
| 8 | 62887847601 |
| 9 | -7070927698807 |
| 10 | -229364654629251 |
| 11 | 31523048882011757 |
| 12 | 1227032077593393801 |
| 13 | -199302585894622665007 |
| 14 | -9050801142483361006251 |
| 15 | 1696260152956539473013557 |
| 16 | 88035625059010432835381601 |