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 | -28 |
| 2 | 882 |
| 3 | -34020 |
| 4 | 1592811 |
| 5 | -89086800 |
| 6 | 5867161716 |
| 7 | -449417759064 |
| 8 | 39615920415765 |
| 9 | -3981820505720948 |
| 10 | 452662784400278870 |
| 11 | -57789054676357516188 |
| 12 | 8232489122499571570239 |
| 13 | -1301235845855032664548680 |
| 14 | 227033226003990207884798040 |
| 15 | -43522196649760447692938214768 |